Yea he and I both know anything mind altering is a terrible idea! Anything that makes him feel different is off limits, this extends to even things like Benadryl - we don't have any meds other than ibuprofen in the house.
I can't explain the chewing tobacco...I don't think he can either. He knows its bad for him, he knows its disgusting. Bleh. He said he is done with it so hopefully he is!