Hello, Fathead. The answer to your question is yes. Yes, you need to lay off smoking weed before your surgery/general anesthesia on Tuesday. You need to do this to keep your lungs clean and clear of smoke and irritants before you are going to be inhaling the anesthesia and oxygen that day. Stay away from cigarette smoke, pollution, smog, and dust, too. Take deep breaths of clean, clear air and practice expanding your lungs to their full extent. Hold those breaths. Then expel and do that again. 15 - 20 repetitions. Three to four times a day between now and Tuesday. Then keep that up for five to seven smoke-free days afterwards, too.

The weed likely doesn't have a negative effect on the anesthesia or other drugs themselves, but the truth is this hasn't been tested and so no one knows that for sure. Weed's strongest neurological and medicine-affecting effects wear off fairly fast. But people who smoke weed have a higher rate of bronchitis, lung infections, and irritation than people who don't. (Just like cigarette smokers do, too.) That's why every smoke-free minute you can give your lungs to make sure they're un-irritated and completely clear and ready to use that anesthesia efficiently will help.

Good luck with your surgery! Let us know how things turn out, OK?