In the wake of Alex Lifeson’s revelations about leaving his cannabis days behind him, we look at other musicians — from Miley Cyrus to Willie Nelson to Paul McCartney to SZA — who’ve talked about quitting

Rush’s Alex Lifeson spent decades as one of rock’s most brilliantly productive stoners. He always played concerts sober, but half-joked to me in 2015 that he wrote “80 percent” of his oft-labyrinthin…