ThIs Is Not Your Father’s Weed
As more states legalize marijuana for medicinal or even recreational purposes, health professionals are sounding “caveat emptor” notes. Older people who stopped smoking pot decades ago but are considering taking it up again are advised that the typical THC content is nearly 17 times greater than in the mid-70s and continues to rise, from 0.75 percent in 1975 to 3.82 percent in 1990 to 9.97 percent in 2000 to 12.55 percent last year. In contrast, most forms of edible marijuana, while highly potent, have tested weaker than advertised. The THC content of smokeable pot ranged in one Colorado study from 13 percent to nearly 21 percent, and can vary greatly even for the same "brand" of pot; test results for samples of several bags of "Blue Dream" ran from 13.5 to 18.7 percent THC.