People substitute alcohol for marijuana at age 21, study says

Alcohol seems to act as a substitute for marijuana when people hit the minimum legal drinking age, a recent study found.

The study, published in the Journal of Health Economics, found — perhaps not surprisingly — that alcohol consumption spikes among people just over the age of 21. But it also found that marijuana use experienced a substantial drop at the same age.

The finding is important to the debate about public policy to regulate the substances. As economic substitutes, how strictly marijuana laws are enforced would affect alcohol use — and vice versa — because people will tend to use whichever substance is cheapest or more available.

Previous studies found murky evidence about whether the two act as substitutes or complements. This study, which looked at five years' worth of survey data from the National Survey on Drug Use and Health, looked directly at the drinking age as a threshold for comparison between the months before and...

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URL: 
http://www.washingtonpost.com/news/to-your-health/wp/2015/07/08/people-substitute-marijuana-for-alcohol-at-age-21-study-says/