Our son came home from 1st year of college smoking pot. We confronted him, expressed our concern but he continues to smoke. We went on a family vacation and initially our son wanted to go, but changed his mind and didn't want to be there. His behavior/attitude was passive aggressive, acting like a spoiled child. We ended up sending him home on the train early because we didn't want to be around his negative behavior anymore. That's what he wanted. His behavior at home has been avoidance of us, speaking only when spoken to, almost like he doesn't like us and doesn't want to be here. We told him that if he has money to buy pot than he has money to buy gas. We are thinking about telling him next summer that if he's still smoking pot then he ha t find somewhere else to live. That's hard to do, but I don't want to have a repeat of this summer and don't want to support his pot habit. Your thoughts? I am new new this website an this my first post.