Thanks for the info Splitimage . I probably didn't get the original post correct to start with . He was smoking but gave it up and was stuck in a caravan for 8 hours at a time ( sleep and down time from work) but his room mate for want of a better term is just caught up in it all and it was just effecting him so badly it wasn't funny. He has at least come home with a better attitude and is slowly calming down . He was just to aggressive and antisocial while he was hanging around his mate and their friends.
So I do think there might be something to the second hand smoke theroy- as with cigaretttes second hand tobacco smoke .
But with help I hope he will be alright
Thank you again
thank you