A 2025 Brown University laboratory study found that, compared with a placebo cannabis, smoking higher-potency THC cannabis was associated with 27% lower alcohol consumption and smoking lower-potency THC cannabis was associated with about 19% lower alcohol consumption during a two-hour ad libitum drinking session.
November 19, 2025
high
statistical
Randomized laboratory experiment in a bar-like setting where participants could drink freely for two hours after smoking cannabis or placebo.
A 2025 Brown University laboratory study reported that participants who smoked THC-containing cannabis delayed initiation of alcohol drinking during a two-hour ad libitum alcohol session compared with participants who received placebo cannabis.
November 19, 2025
high
statistical
Measured time to first drink in a controlled laboratory setting after cannabis or placebo use.