- 1Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
- 2Cancer Research Center, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
- 3Icahn School of Medicine at Mount Sinai, New York, NY, United States
- 4Health Sciences Unit, Faculty of Social Sciences, Tampere University, Tampere, Finland
- 5Statistical Genetics Lab, QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia
- 6Clinical Research Development Center, The Persian Gulf Martyrs, Bushehr University of Medical Science, Bushehr, Iran
- 7Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
- 8Tobacco and Health Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
- 9Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY, United States
- 10Department of Family, Population and Preventive Medicine, Renaissance School of Medicine, Stony Brook University, Stony Brook, NY, United States
- 11Cancer Biology Research Center, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
Introduction: Waterpipe smoking has become increasingly popular in Western countries, particularly among young individuals. This study aims to identify the factors influencing waterpipe smoking by focusing on consumption patterns.
Methods: We utilized data from a multicenter case–control study (IROPICAN) conducted in Iran. Multivariate logistic regression estimated the adjusted odds ratio and 95% confidence intervals as a measure of association between waterpipe smoking and different factors.
Results: Among 3,477 subjects were included, 11.8% were waterpipe smokers. Most of <50 years old smokers were occasional (80%), while daily smokers were often >50 years (85%). Around 59% of occasional users started it before 30 years old. Low education, low SES, alcohol consumption, cigarette smoking, secondhand smoke exposure, and opium use were associated with waterpipe smoking. Stratified analysis by frequency pattern showed an association between occasional smoking with age 0.97 (0.96–0.98), university degree 0.36 (0.17–0.76), urban dwellers 1.40 (1.06–1.86) and between high SES and daily smoking 0.34 (0.17–0.69).
Conclusion: Our results offer valuable information to policymakers for developing waterpipe smoking control measures. The occasional waterpipe smoking results may be generalized to the younger people in Western countries.
1 Introduction
According to the World Health Organization (WHO), in 2023 tobacco smoking will be responsible for approximately 8.3 million deaths worldwide, with a significant impact observed in less-developed countries (1, 2). Waterpipe smoking, a traditional method of tobacco smoking originating from Southwest Asia and North Africa, has been increasing globally at a remarkable pace (3), particularly among young individuals (4–6). The highest prevalence of waterpipe smoking has been reported from countries located in the Eastern Mediterranean region, ranging from 2.5% in Oman to 37.2% in Lebanon (7). In Iran, waterpipe smoke is a significant public health concern, with prevalence reaching up to 10.9% in men and 16.8% in women, particularly in south and southeast Iran (8). Contrary to a slight decline in cigarette smoking over the past few years, waterpipe smoking has increased and is a serious problem, especially among young Iranian women and adolescents (9–12).
In this tobacco smoking method, known by many names such as hookah, shisha, narghile, hubble-bubble, and Kalyan in different cultures and countries, tobacco smoke passes through water, often infused with sweet and fruit flavors (1). Contrary to popular misconception that waterpipe smoking is less harmful than cigarette smoking, it contains several toxic chemicals and poses several health risks (13). The mixture contains more than 40 carcinogenic substances and metals like arsenic, cobalt, chromium, and lead (4, 14). Waterpipe smoking may lead to many health consequences such as lung and oral cancer, respiratory and coronary disorders (14, 15), low birth weight, sexual hormone disorders, and reproductive problems, particularly in women (1).
Numerous studies have examined and reported while personal, sociodemographic, and behavioral characteristics have been identified as factors influencing waterpipe smoking, it is important to recognize that these results are not uniform across various decades, cultural contexts, and geographical regions. There is a wide variation in the prevalence and patterns of waterpipe smoking across different geographical regions. Waterpipe smoking rates may increase in some countries and regions while declining in others. It is likely that this variation is caused by cultural differences, changing social norms, and the availability and accessibility of waterpipe smoking establishments. Understanding this variability is crucial when developing interventions, policies, and prevention strategies to effectively address waterpipe smoking (16–18). In the latest study reported in 2023 from Iran, prevalence of waterpipe smoking was associated with socioeconomic inequalities and lifestyle factors among adults. This study, however, did not provide any information regarding waterpipe metrics, particularly in terms of frequency patterns between daily and occasional users (19).
We aimed at identifying the factors associated with waterpipe smoking among Iranian men and women, and at exploring key waterpipe metrics in daily and occasional waterpipe smokers.
2 Methods
2.1 Study population and data collection
We analyzed data from the control group of IROPICAN project, a large multicenter case–control study conducted in Iran (20). The IROPICAN study was conducted between May 2017 and July 2020 to investigate the association between opium consumption and lung, colorectum, bladder, and head and neck cancer risk. The data was collected from general hospitals located in 10 provinces of Iran (Tehran, Fars, Mazandaran, Kerman, Golestan, Kermanshah, Khorasan-Razavi, Bushehr, Sistan and Baluchistan, and Hormozgan). A total of 3,233 healthy hospital visitors who were accompanying or visiting patients in non-oncology ward were selected as controls. The response rate in control group of the IROPICAN study was 89%.
2.2 Data collection
Trained interviewers employed standard data collection protocols to gather comprehensive information on detailed consumption of opium and tobacco products including cigarette, pipe, nass, and waterpipe. And also, other lifestyle factors such as education, asset ownership including vacuum cleaners, cloth washers, dishwashers, freezers, internet access, microwaves, laptops, mobile phones, cars, and ownership, job history. Data on starting age, stopping age, frequency and amount of use of each tobacco product was collected. Waterpipe smokers were asked about non-flavored (“tumbâk”) and flavored (“maassel”) tobacco. We defined frequency of smoking according to the daily or occasional (weekly or monthly) smoking and calculated amount of use by measuring the number of waterpipe heads smoked in each session. We divided the total number of waterpipe smoked by duration of smoking to derive the average amount of waterpipe smoked (heads per day). Furthermore, we defined a metric called head-year as the cumulative amount of waterpipe tobacco smoking by multiplying the total duration of waterpipe smoke by the average daily amount. A head year indicates smoking one waterpipe head per day for one year.
A principal component analysis was used to define the socioeconomic status (SES) of the participants, based on the number of years of education the participants had and asset ownership (21). Job history classified according to the seven different groups (Table 1).
2.3 Statistical analyses
According to the characteristics of the participants, frequencies were calculated for categorical parameters and mean, and standard deviations (±SD) were for continuous variables Waterpipe metrics were also reported by daily and occasional waterpipe smoking. We used unconditional logistic regression to estimate the adjusted odds ratio (OR) and 95% confidence intervals (CI) between never and ever waterpipe smoking and potential determinants overall and in daily and occasional smokers exclusively. All models were adjusted for age (continuous), gender, province, and SES (low, moderate, high level). All statistical analyses were carried out using Stata 14 (Stata Statistical Software: Release 14. College Station, TX: Stata Corp LLC).
3 Results
A total of 3,477 (2,400 men and 1,077 women) participants were included in our analysis, from which 409 were waterpipe smokers (11.8%) and 3,068 (88.3%) were non water pipe smokers. Numbers of ever-smokers for men and women were 289 (12.0%), and 120 (11.1%), respectively. Participants from Bushehr province had the highest proportion of waterpipe smokers (41.7%), followed by Khorasan Razavi (21.8) and Fars (19.8) provinces. The prevalence of ever waterpipe smoking was higher in individuals younger than 40 (17.9%), and those who were classified in the medium SES level (13.3%). Most of younger than 50 years old smokers were occasional smokers (80%), while daily smokers were often older than 50 years (85%). The prevalence of waterpipe smoking was higher among cigarette smokers 165 (16.9), opium users 87 (28.8), and secondhand cigarette smokers 173 (16.8), however there was no difference in occasional and daily waterpipe smokers. An additional analysis showed flavored tobacco smoking had a reverse association with age [<50 years = 59.46%, and ≥ 50 years = 40.53%] in our study.
Daily smokers used an average of more than 2 heads per day and smoked for a longer period than occasional users. Around 38% of water pipe users try it before 30 years old particularly among occasional users (59.6%) (Table 2). Consequently, they had a higher cumulative waterpipe smoking. It’s noteworthy that most non-favored (traditional) types of tobacco used by daily smokers 138 (92.6) whereas flavored tobacco which used by occasional users 77 (29.6).
Results of logistic regression showed inverse associations between ever waterpipe smoking and high SES (OR = 0.64, 95%CI 0.47–0.87), and university degree education (OR = 0.50, 95%CI 0.29–0.88) (Table 3). Waterpipe smoking was associated with alcohol drinking (OR = 2.61, 95%CI 1.68–4.08), ever cigarette smoking (OR = 2.47, 95%CI 1.91–3.18), secondhand smoking (SHS) (OR = 1.68, 95%CI 1.34–2.11), and regular opium use (OR = 2.35, 95%CI 1.70–3.25). There were no associations between waterpipe smoking and gender, marital status, and employment status.
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Table 3. Characteristics associated with waterpipe smoking – results of multivariate logistic regression analysis.
Stratified analysis by frequency pattern showed an inverse association between 10-yr increase in age and occasional smoking (OR = 0.75, 95%CI 0.66–0.84), high SES with daily smoking (OR = 0.34, 95%CI 0.17–0.69), and university degree with occasional smoking (OR = 0.36, 95%CI 0.17–0.76). There was a significant increase in occasional waterpipe smoking among urban dwellers (OR = 1.40, 95%CI 1.06–1.86). As expected, we identified an association between daily water pipe smoking and regions with a high prevalence of water pipe use (Fars, Bushehr, Systan-Balouchestan, and Hormozgan) (OR = 0.6.20, 95%CI 2.39–16.1) but not with occasional use. In both daily and occasional users, alcohol drinking, cigarette smoking, opium use, and secondhand smoking were similarly associated with waterpipe smoking (Table 3).
4 Discussion
This study was conducted to identify the factors associated with waterpipe smoking in a large sample of the Iranian population. Our results showed a direct association between waterpipe smoking and alcohol drinking, opium use, and cigarette smoking. Based on the frequency of smoking, daily smokers are mainly among people residing in high-prevalence areas who have been smoking waterpipe for an extended period. On the other hand, occasional smokers are more frequent people living in large cities and low-prevalence provinces. There may be a number of factors contributing to this; metropolitan residents tend to be younger, so they engage in tobacco use more for fun and are exposed to high-risk behaviors and lifestyles such as drinking alcohol and smoking cigarettes (22). The occasional smokers were younger and had lower education levels. Factors associated with their habit are probably more relevant to waterpipe smokers in low-prevalence countries, such as Europe and North America.
Previous studies reported that unhealthy lifestyles and behaviors are associated with waterpipe smoking (23). For instance, a survey from Lebanon revealed that waterpipe smoking was more prevalent among college students who binge drank alcohol more often (24). It has been found in previous studies that those with a positive attitude about cigarette smoking, drug use, or alcohol drinking are more likely to be curious about testing waterpipe, while those with a negative attitude are less likely to take it (25). On the other hand, some studies also suggest that the use of water pipes, which entails exposure to nicotine and other addictive chemicals may represent an encouraging factor for using another tobacco product or opioid in the future. Furthermore, it may influence dose or duration of use. There is, however, a need for further investigation and evidence to support this attitude (26).
According to our findings, there is a protective effect in association with higher education levels with occasional waterpipe smoking and among daily users with higher SES levels persons. Abdollahifard et al. reported that low education and low socioeconomic status were associated with waterpipe smoking in Shiraz, Iran (27), where daily waterpipe smoking is prevalence in men and women. Moghadam et al. in 2023 reported similar findings based on analyses of data one center of Persian cohort (19).
We found that most daily smokers prefer nonflavored or traditional tobacco, while occasional smokers, who are younger, prefer flavored tobacco. Previous studies showed that the sweet smell and taste of tobacco have an important role in increasing waterpipe smoking in the youth in many countries, and it is one of the reasons for starting and continuing waterpipe smoking, particularly on social events (27–30). Also, we found most occasional users try the water pipe use for the first time at the age of less than 30. Compared to daily smokers, occasional smokers used lower doses for a longer period of time.
We did not find an association between waterpipe smoking and employment status and marital status. Previous studies have shown inconsistent results regarding these two factors (23, 31). This heterogeneity can be related to several factors, such as the distribution of age and gender of the study population, family and social responsibilities, culture, and geographical location (23, 27, 32). Patterns of waterpipe smoking were not different between men and women: this can be explained by the fact that waterpipe smoking is a custom and traditional source of entertainment for many families, and women can experience it more easily as a leisure time activity in family gatherings both indoors and outdoors compared to cigarette smoking, which are considered taboo, particularly among older women in Iranian culture (33) and other Middle Eastern countries (1, 5).
Developing effective prevention strategies, particularly among young and high-risk populations, would be a useful approach to controlling waterpipe smoking growth. The authors of a recent review concerning waterpipe tobacco smoking control policies reported that little attention is paid to waterpipe policies overall. Most of the countries with guidelines to control this issue are from the East Mediterranean and the European Regions and around 34.1% were included in high-income economy countries. However, globally, despite the growing appreciation of the importance of waterpipe smoking policies, the number of countries that have regulations in place to address waterpipe smoking comprehensively is not increasing. In particular, some regulations are available. But it was not effective in Iran (34).
Our study had several strengths, including the ability to study daily and occasional smokers in the same population, and the high data quality since data was collected by trained interviewers using a validated questionnaire. We also had detailed information on the main determinants and other confounders, such as different tobacco products. The non-response rate among the participants was not very high (11%), and the main reasons were lack of time or unwillingness to donate a biological sample among referents. Collection of lifetime history of waterpipe smoking is an additional strength (20). There was a wide range of exposure prevalence across Iranian provinces, and people from a wide variety of backgrounds cultures, social groups, and geographical locations were included in the study. Finally, according to previous studies in Western countries, most users are occasional users and try it just for entertainment and not for regular and daily use. Our study also included a good number of this type of user. Thus, our findings on occasional users may be relevant to water pipe smokers from Europe or North America, who are young and smoke water pipe occasionally in public settings.
Also, our study suffers from some limitations. We used a control group of a primary case–control study, and this group was matched according to case group characteristics, particularly age and gender, so the study subjects were not a representative sample of the underlying population, especially for those under 30 years of age. We therefore suggest that future studies should include people of all ages. The number of water-pipe smokers, though relatively large, was small in specific subgroups, such as daily and occasional users. In addition, future studies should investigate detailed aspects of waterpipe smoking, such as the duration of the water pipe session, which were not adequately addressed in our study. Finally, information on waterpipe smoking was self-reported and therefore related to memory and may suffer from recall bias.
In conclusion, waterpipe smoking is associated with younger age, low education and socioeconomic status, alcohol drinking, cigarette and opium users. These findings provide valuable information for stakeholders and policymakers in designing awareness and prevention programs to target specific populations at risk. Furthermore, the results of the study suggest that the findings on occasional waterpipe smoking may be generalized to the younger age group of waterpipe smokers in Western countries. For future studies, longitudinal studies to examine the temporal relationship between risk factors and waterpipe smoking initiation or cessation could be useful and also investigating the effectiveness of interventions and prevention programs targeted at waterpipe smoking is crucial.
Data availability statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Ethics statement
The studies involving humans were approved by the Ethics Committee of the National Institute for Medical Research Development (NIMAD) (Code: IR.NIMAD.REC.1394.027). The studies were conducted in accordance with the local legislation and institutional requirements. The participants provided their written informed consent to participate in this study.
Author contributions
MS: Formal analysis, Methodology, Writing – original draft. AS: Formal analysis, Writing – review & editing. HR: Project administration, Writing – review & editing. MH: Project administration, Writing – review & editing. MM: Project administration, Writing – review & editing. AA-M: Project administration, Writing – review & editing. AN: Project administration, Writing – review & editing. PB: Funding acquisition, Methodology, Supervision, Writing – review & editing. KZ: Funding acquisition, Methodology, Supervision, Writing – review & editing.
Funding
The author(s) declare financial support was received for the research, authorship, and/or publication of this article. The study was funded by the National Institute of Medical Research Development (NIMAD) (Grant No. 940045), the Italian Association for Cancer Research (AIRC, Grant No. IG-24706).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Abbreviations
CI, Confidence intervals; OR, Odds ratio; SES, Socioeconomic status; SD, Standard deviations; WHO, World Health Organization
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Keywords: prevention, diseases, public health, tobacco, water pipe
Citation: Seyyedsalehi MS, Shah A, Rashidian H, Hadji M, Marzban M, Ansari-Moghaddam A, Nejatizadeh A, Boffetta P and Zendehdel K (2023) Determinants of waterpipe smoking in Iranian adults: results from the IROPICAN study. Front. Psychiatry. 14:1292503. doi: 10.3389/fpsyt.2023.1292503
Edited by:
Scott E. Hemby, High Point University, United StatesReviewed by:
Snezana Miodraga Radovanovic, University of Kragujevac, SerbiaGorkem Yararbas, Ege University, Türkiye
Copyright © 2023 Seyyedsalehi, Shah, Rashidian, Hadji, Marzban, Ansari-Moghaddam, Nejatizadeh, Boffetta and Zendehdel. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Kazem Zendehdel, kzendeh@sina.tums.ac.ir; Paolo Boffetta, paolo.boffetta@unibo.it