TL, Thanks for the advice. If my son chooses drugs over school, he'll probably just continue using. However, he would be required to get a job to support his habit, since his mom and I won't. I fully understand I can't make him stop using drugs. It's something he'll have to do on his own and hopefully, sooner than later.
I have wrestled with the option of continuing to pay for his college tuition, books and dorm room directly. However, I may require him to get a part time job, in order to pay for his meals, gas and laundry, since I can't pay for those directly. He does have a credit card we had funded, but I'm thinking that may be a mistake as well.
by the way, about a month ago, he sold one of his prized guitars for $450.00 and claimed he needed the money to buy Christmas presents and to repay his mom for a loan she gave him. Needless to say, NONE of the money went toward Christmas and to repay his mom. It promptly disappeared, probably on drugs.
Any additional thoughts are appreciated, as I work toward solidifying the final option(s).