Does Legal Cannabis Increase Alcohol Use? It's Complicated

Is legalized marijuana a gateway drug to other forms of substance abuse? Or would safer access encourage people to ease back on other vices? This has been one of the major questions bedeviling the legalization debate. Now that four American states have legalized recreational use of cannabis, we ought to be getting some answers. Sadly, a review of the studies done so far suggests the picture isn't getting much clearer.

Tracking the use of illegal drugs is hard, but it should be easier to discover whether the use of alcohol and tobacco goes up or down when the legal attitude to pot changes.Dr. Katarína Guttmannová of the University of Washington has investigated the alcohol side of this equation. "We chose to focus on alcohol because even relatively small changes in alcohol consumption could have profound implications for public health, safety and related costs," Guttmannová said in a statement.

The costs of alcohol...

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