That's the thing with addiction I guess, hard to step back and see it and hard to rectify I guess right. (Not impossible though.)
I've never been addicted to any substance so I guess it's difficult to know how it feels but I've dealt with enough who have and I know the challenges and how difficult can be to combat. Sad really. I guess it's like anything, it's so easy, pleasurable even, to fall into that habit, but climbing back out (realising that one needs to) is never so easy.
I like that art man, but it sort of makes me sad too, just the mood that the face presents.
It's common to react the way you are. I see others mention it in the comments as well, how you'll think differently of them. This snowballs for that individual. Eventually they're left with nobody (or their friends are all addicts as well). When it comes time to snap out of it, they feel all that pain of loss at once. Feels like being hit by a truck, internally. Can be unbearable and push people to look for an escape. Death or the bottle.