Yo if you got bad crack with levamisole, switch to another connect or don't smoke that shit. That sucks. I have gotten weird shit with some kind of cut in in before, it made the crack resin turn this nasty black/very dark brown color and tasted like shit every hit, but it looked good and smelled correct when it was rocked up, also it gave me a weird high, like I was high on crack but it made me a bit more fiendish for more than usual. I would also get really good shit that had a nice golden brown resin, that I knew was better without that weird cut in it from the same dude. Both of the rocks good and bad were almost completely the same looking, smelling, etc before being smoked. It was weird. Since then I lost that guys # and have a new solid connect who always has good shit, that doesn't leave nasty black oil in my pipe, gets me feeling nice, and doesn't have that fiendish effect on me (as much at least lol) I can put the pipe down between nice hits for like an hour or more, instead of smoking a 100 piece in 10 minutes haha.