How can you tell if someone is addicted to drugs?

addicts don't follow stereotypes. they are all different. you don't know how they are functioning or if they are in control. addicts are pretty good actors and you may only be seeing one side of their lives. it gets nasty-if not now than in a few years. drugs are hard on the body and mind. I strongly suggest that you branch out to some friends that don't use drugs. you seem like a smart person!