I was allowed by my mum to drink & smoke, and smoke pot. My friends, who were not allowed, did it all anyway.
We started out with the POV that it would be better to know what they are doing. Gave her half an inch & she took a freakin mile
So the rule in our house is, no alcohol until you're 18.
That is my thinking too. My brothers were allowed to smoke cigartettes and then pot in the house/garage by my mother. She turned a blind eye to it all. Dad tried to stop it all, but he was working alot of the time and just wasn't there to watch it all. I am 9 and 10 years younger than my brothers, so when they were 14, I was 4ish and seeing them smoking (only cigarettes at that age) was not a great role model for me. I'm amazed that I grew up never having tried pot or being a smoker. Alcohol wasn't the issue in our house.