I'm now in my 60's and must confess to having an "addictive personality" (if that is the correct phraseology), which I recognise, so have, always avoided "illegal "drugs.
I smoke, like a chimney (though have, now halved my intake) & can "drink like a fish" but have never "crossed the line", because I recognised that I would, always, want more, as I have done with my "legal" drugs.
So, my question is this (without wishing to sound clever, condescending or holier than thou).
Why have others gone down the route of using, either, a soft drug (such as pot) and/or then moved on to hard drugs (Heroine, Cocaine, Crack etc.).