Arthur & Albert Allen, the "Ghetto Fighters", now known by "muslim" names, said Jimi would pop a couple of tabs and people would say, "Well, okay, I'll take one and see how it works out." After the first one, he said they'd be going up the wall (or something along those lines), meanwhile, Jimi would still keep poppin' them into his mouth. There's an interview with them in NYC taken for one of his biography videos.