What idiots use as a euphemism for general drug use and a reason for misbehaviour. Of course they lack the basic knowledge that crack is SMOKED (what do you think a crackpipe is for, dummy?), and not snorted. It's powder cocaine, or llello, yoca cola, A1 Yola, and so on that you snort.
"You've been snorting crack?"
"No, fuckhead. Smoking it."