A 48-year-old guy in Australia recently went to the doctor because he had never-ending sinus infections and headaches. He's been living in misery for 18 years and couldn't figure out what the issue was.
Finally, doctors in Australia did a CT scan and they noticed something wrong. On the scan was a, "firm gray mass" in his nasal cavity. They went in and extracted it. To their surprise, that mass was a small bag of weed.
Turns out the guy snorted the bag 18 years earlier when he was trying to smuggle it into jail but it never came out, so he just assumed it had fallen down his throat and he forgot all about it.
Seems that after the doctors removed it, his health problems cleared up.
Source: Newsweek