I feel the same as you - the only people i smoke with are people my own age, the only person under 18 i've smoked with is my little cuz Joe and he's nearly 16 so i trust him.

It was the same for me with sex - all my mates and me were legal but they were still shagging underage girls - and i'd never do that. Over here i think that's classed a rape immidiatly - although im not too sure.