Vaping HCl on a piece of foil over a lighter, much like with heroin. It works OK I suppose. Erowid reports and my own experience confirm it's active in very low doses. (I didn't quite get all 3mg and I still had mild visuals; I imagine with 5+mg it would have been greatly intensified. And this is after 11mg rectal + 5mg snorted on Friday and ~15mg insufflated last night.) I have no idea what the BP is, but it vaporizes very quickly upon contact with a normal cigarette lighter. The smoke doesn't taste pleasant, but it's not harsh or overwhelming, nothing like would it seem IMO. There is a nasty bodyload though, similar to snorting, but without that whole 'holy fucking shit I think I'm dying and nothing is comfortable, fuck this was a mistake' feeling.