I cannot put myself into the mind of someone who is an addict or alcoholic. I don't know how they think. I have proven this time and time again.
MTSU, as someone who is a closet smoker in 2011 I think you do know something about addiction. Perhaps being honest about why you continue to smoke (and hide it) will give you insight into your son's issues.
I'm not here to be nasty, but this seems like hypocrisy: nicotine is as much of a drug as alcohol and heroin and certainly as deadly.