I tend to think if you're college age or younger it's probably normal, it's a "kid thing" that people often experiment with. I did it a few times between the ages of 17 and 20. But IMO, anyone over 23 or 24 who still does it needs some new hobbies or learn to relax/be happy without the help of an illegal drug that's not healthy for you. I wouldn't date someone who does it a lot and I would definitely not have children with someone who does it.