He's 17 and has been raised by his divorced mom. Grades are good, he works part time and shows no overt behavioral problems... EXCCEPT... mom caught him smoking weed. She's had the usual talks with him, has imposed a curfew and he is no longer allowed to use the car (as much for safety reasons as, as a consequence) but he states that he does not want to quit smoking and will not participate in counseling. Advice please.