Smoked weed at university and after, while working full time. Smoked pretty heavily, most evenings. Found it habitually addictive (couldnt chill or sleep without it) and have since stopped.
Taken coke regularly for years, maybe 10 of so, on average once or twice a month with periods of using it weekly. Always with friends, at parties, never in a bad place or when on my own. At the time, didn't think this was addicting but looking back we ALWAYS had it for parties/nights out. If I didn't have my own, it was easy enough to get some from friends/contacts.
Pills/MDNA - occasionally, for big nights or festivals. Great times, but horrible comedowns, awfully emotional for days after. Some of my fondest memories though - just feeling so happy, carefree and full of love for my friends and appreciation for the environment around me.
I don't regret any of my choices. I had fun and was never reckless. When pills were passed round at a party, I would stash mine until an hour or so after everyone else had taken theirs, just to see if they could be dodgy. Then when I would take it, I would bite it into quarters and take 1/4 each couple of hours, so 1 pill would last me til the early hours of the party.
Eve now, in my group (early 30s), it's commonplace to get some cock in for a birthday party/NYE, and we're all high-achieving professionals in full-time work.
Your son will probably be offered drugs in his teens/early 20s when his peers are exploring. If you're honest with him about the associated risks, he might make decisions based on logic (like I did with rationing my 1 pill) rather than peer pressure. But don't think you'll be able to scaremonger or convince him out of ever trying them. I never thought I would take drugs. I grew up with the DRUGS ARE BAD mentality, this applied to all drugs. Then I went to uni and it seemed everyone was smoking weed, my friends from home started doing coke (they all worked full time) so it seemed OK for me to do it too. That eventually led to holidays raving in Ibiza high on ecstasy. It's interesting how you become so softened to it all over time, it doesnt seem as scary when you find out more about it and all your friends are doing it.
I often wonder if any of my colleagues or family would ever suspect me for the secrets I have.
I'd like to add I am pregnant now and wouldn't dream of taking anything. Also plan to happily leave this kind of stuff in my pre-pregancy/parenthood life.