When weed is legalised, alcohol sales drop and junk food flies off the shelves
IT IS COMMON knowledge that smoking marijuana causes cravings for high-calorie snacks. The condition, known as the munchies, is a staple of popular culture. Yet empirical evidence of the phenomenon and its effects is scarce. Does getting high cause smokers to consume more junk food? And if so, by how much?
To answer this question, Michele Baggio of the University of Connecticut and Alberto Chong of Georgia State University examined state laws in America. Since the mid-1990s, more than 30 states have authorised marijuana for medical purposes and 11 have legalised it for recreational use. Because these laws were enacted at different times and in different places, they created a natural experiment for researchers to study the effects of marijuana—including its effect on food consumption.
They found that after recreational marijuana was legalised in Colorado, Oregon and Washington, the only states for which 18 months of sales data were available, sales of ice cream rose by 3.1%, sales of cookies increased by 4.1% and sales of crisps jumped by 5.3% in the years after the laws were passed .
Marijuana may affect our shopping habits in other ways, too. In another paper, Baggio and Chong, along with Sungoh Kwon of the University of Connecticut, found that legalising medical marijuana reduced alcohol sales by more than 12%. This “substitution effect” was larger than previously thought and lasted for up to two years after legalisation .
One explanation for this effect may be that some people use alcohol to treat pain. When medical marijuana becomes available, they swap one pain reliever for another. A sensible approach, perhaps, given the relative harm posed by excessive alcohol use. Those watching their weight, however, may want to avoid the snack aisle.
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