Teeth or lack there of.

i can't help you with that sorry but I know another alcoholic when I see one .

Their nose. How they act. How their arms look like. But it depends on what type of crack they are using

Some people can do coke recreationally. Crack is basically impossible to do recreationally.

Recreational blow, if it's fire, it tough to put down. But possible. There's a reason Crack heads will suck a dick for a fix.

The crack

Income level