It's at least an empirical opinion. Apart from some extraordinary individuals I am not aware of a heavy pot smoker (from among my retinue of friends/aquaintance

It's at least an empirical opinion. Apart from some extraordinary individuals I am not aware of a heavy pot smoker (from among my retinue of friends/aquaintances/people I know about) who does not suffer from some form of associated problem. I'm willing & happy to be proved wrong, but there hasn't been enough studies yet to prove one way or the other (though as far as I last read it was starting to come down on the side of what I have seen)