Regarding parents and their views on drugs, etc...
My parents have always been kind of open minded when it came to us kids having our first parties, experimenting with drugs, etc. We openly talked about these topics at home, and i think it was good like that. They didn't encourage us to take drugs (and there were clear lines/rules about hard drugs (cocaine, heroin, etc... not like any of us kids would have wanted to try those anyway)), but they preferred us to be honest about it and not hide it from them or lie about it when we wanted to try something.
I remember how my mom once told me "i would prefer if you smoked a joint a day instead of half a pack of cigarettes".
My parents didn't take any drugs by the way (apart from the occasional glass of wine).
Now let's take our family as an example and compare it to the neighbours family, where drugs were a big tabou. They told their kids to never do drugs, it's something bad, we don't tolerate it, blabla. Their kids came over to our house to smoke their weed, because they knew our parents didn't mind. They pretended to be the perfect kids in front of their own parents (my parents encouraged them to be honest with their parents, they didn't have the guts to do it tho).
Now let's go forward in time about 10 years.
My brother has just finished his law studies and is on his best way to become a lawyer. He's married, no kids yet but can't be long, beautiful and smart wife, lives in a beautiful house, blabla... perfect life. Takes no drugs at all beside some alcohol from time to time.
I have a good job as an event manager, good income, nice apartment, spare money to finance my love for making music, happy life, blabla. To this day, i smoke weed, but stay clear from other drugs. I don't drink.
And now the other two kids from the "perfect" neighbour family...
The daughter has married a man who does nothing but drink too much, problems at home all the time, divorced now, single mother with three kids and no outlook, you get the idea.
Their son has married a "party girl" dumb as a stick, they met at a rave. He's had several drug problems with hard drugs, got arrested numerous times, was in jail, had to pay huge fines for drug abuse, etc. Problems at home, physical fights, divorce, she has the kid now... he still has drug problems, tried to kill himself in the car, etc.
Go figure.