In The American Conservative. Read it.
King's formative drug experiences were separated from mine by a decade or so and about 200 miles.
Mine started pretty tame in high school and advanced a bit after, his were more exotic in high school than mine ever got (perhaps because I went directly from high school to boot camp and therefore had to exercise a certain degree of discretion for some time). Methamphetamine hadn't yet really cast its shadow over my home town of Lebanon and LSD was something you had to know someone in Springfield to get.
Nonetheless, the tone of King's mini-memoir rings very true. I'm given to understand that the article may presage a book, and look forward to reading that as well.