When I was about 9, I read in a book (the Ramona Quimby books for those who remember those) about a girl who in order to get her dad to stop smoking made all these signs describing the dangers of smoking (such as fires, black lungs, etc) and put them all over the house. I thought I could do that with my parents since they both smoked. I put signs on their bedroom door, under my dad's razor, and in their bathrobe pockets. All these years later I never found out what they thought about all that, but it didn't work since they both still smoke 2-3 packs a day.
A childhood belief about smoking

others believed things like this
- Having seen enough red octagonal STOP signs in my time, I used to look out for green circular GO signs.— Gary
- I used to think that my dad was "smoking pot" when he would smoke his pipe while sitting on the toilet. Anon
- I used to see "End Road Work" signs, and thought they were a sort of protest.— Sebastian
- I thought that smoking pot involved an actual pot from the kitchen.— Aeris
- I used to believe that the sky had stop lights and road signs floating about for the airplanes.
— LoonaSM's - I used to think that Mice controlled the Stop lights and crosswalk signs.Anon