What makes you think that? Unless you are a minor, patient-doctor confidentiality is strictly enforced. Unless required by law, such as a court order, then authorities can look into those records without consequences.
I highly doubt all that. At least thousands of people go to their doctors for medical help concerning illicit drug use, whether it's at their gp or an emergency hospital. They are there to save lives, hopefully, and not ruin them.
Prescription pain killers, drinking and smoking aren't substance abuse disorders?? Lololol. Prescriptions are still narcotics. Some prime examples are adderall and vicodin. Do you not know what AA is? Nicotine isn't a substance? They also have rehab for everything; illegal, prescriptions, alcohol and even smoking cigs. The definition of substance abuse is an abuse of a substance, wow, and it doesn't matter what kind.
This fear mongering of yours is very annoying. Your pestering of anything that has to do with me, indirectly or not, is also extremely weird. I advise you to lose this obsession and find a different hobby.
Edit: Btw, I didn't need Google for any of that. It's called life experience. Have fun wasting hours trying to disprove what I say. And having an open-minded approach helps too.