The picture of weed shared by many older Americans, drawn from their own college years, helped ease the path of legalization. Weed, the mellow drug. The Cheech-and-Chong drug. The Grateful-Dead-road-trip drug. The munchies drug. The drug that, if anything, makes you overly cautious behind the wheel. Dowd thought of marijuana along similar lines " that is, until she tried the legalized stuff for herself and nearly lost her ever-loving mind. Since then, weed potency has only intensified, with some concentrates reaching near-pure levels of THC, the plant's primary psychoactive compound. Only now are policy makers and opinion elites reckoning with what Big Weed has wrought: "turning a drug that used to be 5% THC, and made people pass out for a few hours and eat Cheetos, into one that triggers psycho killers," as Kevin Sabet, a former drug adviser in successive Democratic and GOP administrations, tells me.