Children are like sponges man
Yet they don't know what you are doing when you drink?
They see you smoking a fatty, they will more than likely feel inclined to do so. I don't want my 12 year old getting stoned
Hiding it will ultimately be a lot worse than being open about it. No one wnats their 12 year old blazing, but I just have not seen the culture of shame and hiding be very effective at stopping kids from doing things. If anything, it makes things worse because they start hiding their addictions.