Cannabis and Tobacco: Peer-Reviewed Research Consensus

Adding Cannabis to Alcohol During Pregnancy Increases Risk of Small Babies

This is one of the first large studies to isolate cannabis's additive effect on birth outcomes beyond alcohol — showing that polysubstance use compounds risk in measurable, clinically significant ways.

8% of Americans Co-Use Tobacco and Cannabis — Here's How They Do It

Co-use of tobacco and cannabis compounds health risks (as shown by RTHC-08179), and understanding how people combine these substances is essential for prevention. The age-based differences in administration routes suggest different intervention approaches are needed for different generations.

Cannabis Legalization Drives Up Tobacco-Cannabis Co-Use While Reducing Tobacco-Only Use

While legalization reduces tobacco-only use, the simultaneous increase in tobacco-cannabis co-use — which combines the health risks of both substances — represents an unintended consequence that public health responses must address.

Cannabis Co-Use Made Smokers Less Likely to Quit Cigarettes

As cannabis becomes more accessible, the proportion of cigarette smokers who also use cannabis is growing. This study reveals a previously underappreciated barrier to tobacco cessation: cannabis co-use may reduce the likelihood of quitting smoking, complicating public health efforts to reduce tobacc

Cannabis Users Are More Sensitive to Cigarette Price Increases Than Non-Users

As cannabis use rises and cigarette smoking declines, understanding how these markets interact helps design more effective tobacco control policy. If co-users are more price-sensitive, tobacco taxes provide extra benefit for this growing subgroup.

Treating Alcohol Addiction Also Reduces Cannabis and Cigarette Use — Even When That's Not the Goal

The finding that treating one substance problem can ripple across others challenges the single-substance treatment model — and suggests comprehensive substance use screening should be standard in addiction trials.