There is no direct connection between Pot Smoking and folk music, it's just that in the 60's and early 70's many of the sort of people who went in for one tended to go in for the other. I can think of one well-known fiddle player who did use pot a lot and whose health has suffered seriously as result. On the other hand, I also know a folk magazine editor in her 60's who still enjoys a spliff, and is in very good health.

I used to enjoy the odd joint, but I don't like smoking (or smoky atmospheres) so it's something I grew out of. Mind you, I wouldn't turn down the odd hash cookie !