szuko000 is right: if you try to smoke cocaine HCl ('cocaine powder') it won't burn cleanly and the harsh smoke will choke you up in your throat intantly, upon contact. MDMA.HCl ('molly') can't be smoked for similar reasons, but unlike cocaine, whose freebase form is a waxy, smokeable solid ('crack'), MDMA freebase is a greasy, non-smokeable oil which is best taken orally if you ever by remote chance end up with any. Methamphetamine.HCl ('ice methamphetamine') is not smokeable either, direct flame will destroy the drug, but is quite vaporizable either in its rock ('shards') or crushed up, powdered forms. Methamphetamine freebase is a caustic, non-smokeable (to my knowledge oil) oil. Ice methamphetamine (pure or nearly pure, recrystallized methamphetamine hydrochloride) is one of the few drug forms I know of which IS suitable for hot railing. Certainly these other forms mentioned here are not.