the best thing would be to wait to you havwe a place of your own as growing in you parents house can have all sorts of hassle. 1 if you live in rented accomadatoin your parents could be evicted 2 the householder would be charged not you then all the neighbours would think the are druggies.3 they will smell it or notice the rise in there power bills. so just wait to you get your own gaf and dont get your parents into trouble be safe the postman.