my friend thought that "track marks" were something you got from running track. we were 16 at the time. and she ran track.
A childhood belief about drugs

others believed things like this
- I used to believe that if the tyres were removed from a car, it would work perfectly on a railway track.— Anonymous Whistleblower
- I used to think that the laugh track on sitcoms were the camera men, directors, other actors, ect. laughing.Anon
- I thought that exclamation marks were actually "explanation marks", since they explain how you pronounce it.— superoid
- I used to believe that beauty marks (freckels) were Butterfly bites!— Jolene
- I used to think running for president involved actually running somewhere.— Artimage
- At about age 7 I thought one could see the people running around on a map, if one looked hard enough.— Adam Smith