As you might have noticed, the rise of weed in the US has coincided with public perception shifting in favor of the drug and law changes throughout the country. A majority of Americans supported legalizing marijuana in 2013, which was up from less than a third 11 years earlier, according to a report by The Washington Post. Now, recreational cannabis is legal in four states -- Alaska, Colorado, Oregon, Washington -- and the District of Columbia. Medical marijuana is legal in 23 states, plus D.C., per the report.
However, Deborah Hasin, a professor of epidemiology in psychiatry at Columbia University and lead author of the study, told WaPo it's not entirely clear why there's been such a massive increase in Mary Jane and that more research needs to be done. But, uh, who'd ever volunteer for that kind of research?