Is there a causal link between pot smoking and grey hairs?

I doubt very much if there is any real connection. I couldn't find any scientific evidence on the web, just blogs and such of people who think there is a connection (but these people don't seem to have any advanced background in science of any kind).

Some people start getting gray earlier than others. For example, my mother said she was completely gray by the time she was in her twenties. She died her hair black. She never smoked pot in her life. My father was not prematurely gray and didn't smoke pot either. I used to smoke pot and I started to get gray when I was still in my teens. My brother also smoked pot, but started later than I did, and he didn't get prematurely gray.

I think it has more to do with heredity than anything else. I got gray early because I got more of that gene from my mother.

kinda the thc in pot blocks nutrients that helps keep color in skin and hair but then again gray hair comes natural with age