I was 12, smoking with my cousin and her boyfriend. The woman that supplied us with it (who was an adult) didn't care how old I was. When we tried to get some beer from her she said, "I'll smoke you up at that age, but I will not give kids alcohol under any circumstances". So we then went out and found someone else who did.
At 13 I got my own weed from friends at school, but then I stopped smoking for awhile and started drinking a lot until I was 18. I then started back up. I've been smoking for 7 years straight now.