Public-health experts worry about the increasingly potent options available, and the striking number of constant users. “Cannabis is potentially a real public-health problem,” said Mark A. R. Kleiman, a professor of public policy at New York University. “It wasn’t obvious to me 25 years ago, when 9 percent of self-reported cannabis users over the last month reported daily or near-daily use. I always was prepared to say, ‘No, it’s not a very abusable drug. Nine percent of anybody will do something stupid.’ But that number is now [something like] 40 percent.”
But cannabis is not benign, even if it is relatively benign, compared with alcohol, opiates, and cigarettes, among other substances. Thousands of Americans are finding their own use problematic in a climate where pot products are getting more potent, more socially acceptable to use, and yet easier to come by, not that it was particularly hard before.
For Keith Humphreys, a professor of psychiatry and behavioral sciences at Stanford University, the most compelling evidence of the deleterious effects comes from users themselves. “In large national surveys, about one in 10 people who smoke it say they have a lot of problems.
The country is in the midst of a volte-face on marijuana. The federal government still classifies cannabis as a Schedule I drug, with no accepted medical use. (Meth and PCP, among other drugs, are Schedule II.) Politicians still argue it is a gateway to the use of things like heroin and cocaine. The country still spends billions of dollars fighting it in a bloody and futile drug war, and still arrests more people for offenses related to cannabis than it does for all violent crimes combined.
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