When I was little I used to believe that if you take medicine when you're not sick, you'll get sick. (Like, if you take headache medicine you'll get a headache, if you take stomachache medicine you'll get a stomachache, etc.) I believed this until I was 11. To this day I'm still terrified of taking medicine when I don't need it. That's probably a good thing!
A childhood belief about drugs

others believed things like this
- I used to honestly think that Smarties were medicine.Anon
- I thought Tic-Tacs were medicine until I was 11 years old.Anon
- I used to think that when doctors didn't want to prescribe you medicine, they'd give you a gazebo.— JD
- I thought Viagra was an allergy medicine for a really long time.Anon
- I believed Dr. Pepper was pepper-flavored medicine and was afraid to drink it.Anon
- I used to believe that the bubble gum medicine was really made of bubble gum. i believed this until i was 16.— Shawn