My mom drug tested me, I told her it would be positive, she still took me in, and it showed up positive! If your parents do take you to the doctor to get drug tested, ask your parents to tell the doctor to not put it on your record and to pay with cash, not with any health insurance. I told my mom that she could punish me however she liked, but there is no reason that she would want a positive drug test to be on my medical record.

My doctor knows that I smoke, and he even recommended it to me under the table for my tourettes and such. I just ask him whenever I get put on any medication if my lifestyle would interfere with the medication. He has only said yes once, and that is when I caught tuberculosis and was Isoniozid which is a very strong medication and he said that smoking when using Iso could cause problems, so I stopped for 6 months.

You could just ask your doctor if there are any substances that would interfere with medications. Try to be broad with the "substances", or go and look it up online to see what medications clash with cannabinoids/THC.