Simultaneous cannabis and alcohol use, defined as using both substances at the same time so their effects overlap, increased in adults from 2008 to 2019, according to new research. Shifts in cannabis legislation have raised questions about unintended effects on cannabis and alcohol use patterns, whereby policy changes might lead people to use both substances. Until now, the relationships between recreational cannabis laws (RCLs) and changes in simultaneous cannabis/alcohol use prevalence had remain untested.
