It’s a good question really. I did a fair bit of weed for a couple of years, but many many years ago.
There was never an urge to try anything stronger though did dabble with acid once and decided that was definitely too freaky.
Someone offered me crack once (not the good crack 
) and I said nah, no chance.
I went off the weed pretty quickly. Two reasons really - for one thing it just bored me. A bit to laugh and chat was fun for a while, but then you just veg out and get too mellow.
I don’t need drugs to help me veg out on a sofa!
The other thing was, I started noticing friends who used it a lot were undergoing a personality change and losing the will to do much of anything.
The stoner attitude might be fine up to a point but imo it doesn’t do people any favours in the real world longer term and it does seem to become a bit of a crutch for some people.
A few years later one of those friends took his own life.
I wouldn’t say the weed CAUSED that but I do genuinely think it added to his psychological problems and worked to deepen a bit of a psychosis that was already there.
So people really shouldn’t think weed is ‘safe’ imo. In moderation, probably, and probably alright for most people if they don’t overdo it, but some should probably never touch it.
Why did I try these things in the first place? No idea really. Just experimenting I guess but certainly never had the urge to try harder drugs.
Sorry, wandered a bit from the OP 
