When I was 5 and an adult I knew would get drunk or smoke, my Mom showed me a video to make sure I wouldn't do it when I was older, and the video showed that this weird black stuff accumulated in the lungs of someone who smokes. I thought it was a sludge monster, and that it was going to come alive out of the vial they had it in and eat her, and I thought alcohol was some kind of special drink that made you happy, but if you were greedy and wanted to much happiness, it would make you sleep so that you wouldn't be happy at all.
Safe to say I was a weird kid
A childhood belief about smoking

others believed things like this
- I used to believe that if you used the kids' shampoos that said 'no tears' it would make you happy.— Emmy
- I thought if you point the video camera at the TV then both the video camera and the TV will explode.
Anon - I used to believe that I HAD to make up my own language and teach it to everyone. I was soo weird.— one day maybe!
- i used to think that the world used to be black and white, cos that's what grandma's pictures showed me...— bgumm
- when I was about 7 I thought that aliens hid under my bed. I wouldn'd sleep in my bed for a whole year!— *Rachel*
- when i was small, i thought if i don't sleep then morning wouldn't come..— lily