Recent Research

Suicidal Thoughts and Attempts Among Street-involved Youth

There is a considerably higher suicide rate among homeless or street-involved youth compared to the general youth population. New research by Frederick et al. (2012) looks at this discrepancy by examining variables associated with both suicidal thoughts and attempts among 150 homeless or street-involved youth in Toronto, Canada. Their results underscore the negative impacts of depression, self-harm, bullying, and on-street discrimination in relation to suicidal ideation and attempts.

Tyler J Frederick; Maritt Kirst; Patricia G Erickson (2012). Suicide attempts and suicidal ideation among street-involved youth in Toronto. Advances in Mental Health: Vol. 11, Substance Use and Mental Health, pp. 8-17. doi: 10.5172/jamh.2012.11.1.8 (abstract)

Concurrent Smoking and Drinking Among College Students

Cigarette smoking and drinking commonly co-occur in college students, yet few studies have examined the factors that influence concurrent use in this population. A recent study by Witkiewitz et al. (2012) used a 21-day electronic diary of US college students to examine event-level associations between smoking and drinking in the students’ natural environment. They found that students drank more while smoking and smoked three times as many cigarettes during drinking episodes. Further, being with others at a party or bar, as well as increased stress, were associated with increased odds of smoking while drinking. Social settings and stress are key factors to consider for future prevention and intervention efforts in this population.

Witkiewitz K, Desai SA, Steckler G, Jackson KM, Bowen S, Leigh BC, et al. Concurrent drinking and smoking among college students: An event-level analysis. Psychol Addict Behav 2012, 26(3):649-54 (abstract)

Drinking and Smoking at a Young Age Lead to Cannabis Use in Early Adulthood

A recently published study by Behrendt et al. (2012) examined the association between age at first alcohol and tobacco use, and cannabis use in early adulthood. They found that those individuals who began drinking alcohol at a younger age were more likely to smoke cannabis in early adulthood. Further, individuals who began smoking tobacco at a younger age were more likely to begin smoking cannabis at a young age as well. These findings suggest that the early onset of both alcohol and tobacco use have direct implications for cannabis use later in life.

Behrendt S, Beesdo-Baum K, Hofler M, Perkonigg A, Buhringer G, Lieb R et al. The relevance of age at first alcohol and nicotine use for initiation of cannabis use and progression to cannabis use disorders. Drug and Alcohol Dependence 2012, 123(1-3):48-56 (abstract)

Neighbourhood Cohesion Associated with Levels of Alcohol, Cannabis and Tobacco Use

A recent study by Lin et al. (2012) looked at how one’s neighbourhood can have an effect on substance use. Specifically, they explored the association between perceived neighbourhood cohesion and alcohol, cannabis, and tobacco use. They found that individuals who perceived their neighbourhood as more cohesive had higher annual frequency of alcohol consumption, but lower consumption on a typical drinking occasion. Higher perceived cohesion was also associated with a decrease in the probability of tobacco and cannabis use and of the amounts consumed. Further, area-level census aggregated neighbourhood cohesion exerted an additional effect on the frequency of tobacco and cannabis consumption over-and-above individual perceptions of cohesion.

Lin EY, Witten K, Casswell S, You RQ. Neighbourhood matters: Perceptions of neighbourhood cohesiveness and associations with alcohol, cannabis and tobacco. Drug and Alcohol Review 2012, 31(4):402-412 (abstract)

Smokers Who Quit are Less Likely to Suffer from Major Depression

In a recent study by Khaled et al (2012), the authors explored the association between smoking and major depression. They examined 12-year risk of major depression among persistent heavy smokers, as compared to former heavy smokers, using data from the National Population Health Survey (NPHS) in Canada. The authors found that current heavy smokers were over three times more likely than former heavy smokers to experience an episode of major depression, even after accounting for differences in age, sex, and stress. Further, former heavy smokers became increasingly less likely to suffer from major depression the longer they were abstinent from smoking, pointing to the benefits of smoking cessation maintenance.

Khaled SM, Bulloch AG, Williams JV, Hill JC, Lavorato DH, Patten SB. Persistent heavy smoking as risk factor for major depression (MD) incidence – evidence from a longitudinal Canadian cohort of the National Population Health Survey. J Psychiatr Res 2012, 46(4):436-443 (abstract)

Delusional-like Experiences More Common Among Users of Tobacco, Alcohol, and Cannabis

A recent study by Saha et al. (2011) explored the association between delusional-like experiences (DLE) and three commonly used substances – tobacco, alcohol, and cannabis. With respect to tobacco use, compared to nonusers, DLE were more common in those who smoked daily, began smoking before the age of 16, and smoked heavily (>22 cigarettes per day). DLE were also more common among both cannabis and alcohol users, and were most prominent among early onset users. The authors conclude that the influences of these three substances on psychosis-related outcomes warrants closer scrutiny in longitudinal prospective studies.

Saha S, Scott JG, Varghese D, Degenhardt L, Slade T, and McGrath JJ. The association between delusional-like experiences, and tobacco, alcohol or cannabis use: a nationwide population based survey. BMC Psychiatry 2011,11:202 (abstract)

Marijuana Use Prevalent Among Smokers

A recent study by Ramo and Prochaska (2012) examined past-month marijuana use, as well as the co-use of marijuana and tobacco, among young adult smokers in a national US sample. More than half (53%) of their sample reported past month marijuana use, with a median use of 18 out of the past 30 days. Further, co-use of tobacco and marijuana occurred on nearly half (46%) of the days on which either substance was used, and was more frequent among daily versus nondaily smokers. The authors conclude that cessation treatments for young adult smokers should broaden intervention targets to include marijuana.

Ramo DE and Prochaska JJ. Prevalence and co-use of marijuana among young adult cigarette smokers: An anonymous online national survey. Addiction Science & Clinical Practice 2012,7:5 (abstract)

Our Vision

The Population Research Initiative on Mental Health and Addictions (PRIMHA) is committed to reducing the burden of co-occurring mental health and addiction issues linked with tobacco use in Canada through innovative research that informs population and social change. Addiction and mental health issues are conditions that often co-exist – research in Canada among the general population has shown that people with depression and anxiety are about twice as likely to smoke as those without. Of current smokers aged 19 to 29, 54% reported binge drinking in the past month, compared to 32% of nonsmokers. [1]  Addictions and mental health issues are among the most important contributors to preventable illness in Canada, costing over $20 billion a year.[2]  We seek to better understand the prevalence and correlates of addictions related to tobacco and other substance use, and mental health issues that affect so many in Canada (Figure 1).

Figure 1: PRIMHA Focus Areas




[1] Data source: Statistics Canada (2008). Canadian Community Health Survey 2007/8.

[2] The Standing Senate Committee on Social Affairs, Science & Technology (2004). Mental health, mental illness and addiction: An overview of policies and programs in Canada. Ottawa: Senate Canada.