I would definately care and prefer my child was never told or introduced to believing occasional is fine - Just because you say it is doesn't mean they will take in your advice. Cannabis - Admit if others smoke it then whatever to me it's not my problem but I wouldn't live with anyone who did because one of my experiencing around someone who smoked this stuff wasn't pleasant and 'ok' who started smoking it 'occasionally'. Would I go mad? Nah probably not (depending on what it was) but I'd prefer if that came around to explain the negative never the positive. I'm not a goody goody definately far from it but if it's illegal its illegal end of.