Sclark8756

One joint (unfiltered) is the equivalent of a pack of cigarettes on your lungs. You need your lungs to be in the best possible shape before and during and after surgery. Hacking up tar is not optimal. Also, yes, the THC does cause an unknown element with your anesthesia. I would be brutally honest with your medical team (they don't give two hoots about legality-believe me). As a nurse, I can tell you that there is NOTHING more annoying than being lied to about drug use, when trying to give a patient the the best, most informed care possible. They may want you to be competely clean for a certain amount of time to ensure your best possible outcome.
Be honest and upfront. There are many options for anxiety, both behavioral and pharmaceutical that are available. Ask for help. Go to your PCP. There is also a 12-Step program for dealing with marijuana addiction. Take care of yourself and good luck.