States that permit recreational marijuana sales tend to have lower rates of vaping-related hospitalizations, according to data published by the Centers for Disease Control and Prevention (CDC). The CDC has linked vitamin E acetate, an adulterant typically reserved to the black market, to 48 of the 51 hospitalized patients it has examined. Governments have often responded to these contaminations by enacting bans on e-cigarettes and other vaping products, but the CDC data suggest they should take the opposite approach.
From my column with Jacob Rich at reason.com.