I do not think there is "The Answer" as each person, family, life experiences are all different. I will say that out of respect for our one grown son and my Lady(30 yrs. old and is Conservative, to my Liberal)and the effects of second hand smoke. When he was a baby and growing up I did my partaking after he went to bed or I was out of the house at friends'. He also had D.A.R.E. in elementary and high school And I will say...simply...he knew once he was in middle school but we didn't talk about it until the latter years of high school. And Yes, the paranoia was there as school officials plus the police and society were all for the children/young adults/students squealing on their parents......
To be honest growing up in the 60's and very early 70's I never thought in my life time I would see that medical usage along with recreational would ever be legalized or total decriminalization at the local and state level. Of course the Feds(by the way Hello...since you do monitor all communication on computers) can. Pull the plug at any time.....
Now, today he likes to drink quality Beers, Ales and such and I prefer my smokeable's. in his apartment I do not partake as this is his wish and I respect and honor his wishes...everything is good. Just as in my household he knows I will and he accepts that. What I find interesting is he says he never has attempted even tho he went through College and some of his friends do even now. I told him that it's better then Alcohol and he should give it 'a go'...but he says simply no and I respect his wishes.....
The door is not totally closed..............
Be good.....Frodo