We never smoked in anyone's home that didn't smoke( no matter how much they said "go ahead") and we never smoked in restaurants.
I forgot to tell you my favorite. Mixing acetylene and oxygen in a baloon, or whatever is handy. GO BOOM! We did this in vocational school, drove the instructor mad. We'd probably go to jail for it in today's academic climate. Well, most of us in this line of work ain't right anyway. My point is Plain oxygen out of the bottle will not GO BOOM.