I switched my drug of choice from alcohol to meth to opiates & back to alcohol.
I myself instead of struggling with the environmental and trauma, but I struggle with the disease model vs full blown sin that becomes addiction. However, one thing I haven't been doing lately is not focusing on the "why's" of using, but staying clean no matter what. Part of me didn't want to buy into the disease model because I didn't want to go to meeting the rest of my life....I wanted to be lazy and just be cured....
So perhaps like what sugah asked your son needs to ask, "are you ready to change?"
Blessings, Sheila