Tobacco and cannabis (marijuana) are frequently used together, and this study set out to determine if the usage of marijuana interfered with the success of those wishing to cease tobacco usage.
1,246 treatment-seeking tobacco smokers were enrolled in this study, and 220 of those were current marijuana users. Outcomes were determined after 12 weeks of pharmacological treatment consisting of pills vs. nicotine patch vs. placebo, combined with behavioral counseling.
The results found that cannabis users were as successful at achieving biochemically verified abstinence as compared to tobacco-only smokers. In other words marijuana use did NOT interfere with successfully quitting tobacco.
