My mum told me that if you sniffed poppies your nose would bleed.
A childhood belief about plants

others believed things like this
- I used to think that if you didn't blow your nose and just sniffed the snot up, you head would blow up.Anon
- I used to believe that if you sniffed a really stinky fart, it would poison your insides and die.— Fartcheeks
- When I was in Kindergarten I was told if I picked my nose my nose will go into eternal bleeding— Sam
- My grandparents always told me that if I picked my nose too much, my nose would get bigger.— The Mortal Elf
- My older brother told me that everytime you sneezed your lungs would bleed. I believed this until I was 21!— Gem
- I used to believe that if and when you got your hair cut it would all bleed— JC