Lidocaine's a topical analgesic (pain reliever) and isn't something they'll be using on you intravenously to put you to sleep. As long as they know you're allergic, that's as far as your involvement with that drug will go.

I'm guessing you're going to be simply IV-sedated. FBR may know of D&C instances where they'd need to do full-out intubation anesthesia, but I've never heard of those circumstances. I've had D&Cs after miscarriages, and I was simply heavily sedated with Valium or something like it. You're a little woozy and very relaxed when you wake up, but that's why they watch you for a while afterwards and insist that someone else drive you home and keep an eye on your afterwards.

A D&C won't require more than 10 minutes, and probably way less. Unless they simply think that, because of your addiction history, you may require more sedation than most folks, you will likely wake up like normal and be groggy if you had Valium and more wide awake if they used one of the shorter-acting anesthetics like propolol.

Just make sure you tell them the whole story, particularly your anesthesiologist, and that means about your cigarette use, too. You sound like you're anxious both about the procedure and about the fact that you're going to have to do without your cigarettes and weed before and after. They're correct that you shouldn't smoke cigarettes afterwards, and it'd be far more ideal if you left them off today and didn't smoke again till 3 to 5 days after your procedure's over. You're going to have some expected bleeding after that procedure, and cigarettes don't help wounds--in your case the entire interior surface of your uterus and your cervical os will be your wounds--seal off and heal normally. They also increase your risk of infection and other post-op complications like deep vein thromboses. So they weren't lying about it not being a good idea to smoke afterwards.

Obviously, in a nation of nearly 50 million cigarette smokers, people don't always follow those instructions. But if you want your surgery to be successful and your recovery uncomplicated, try and abstain from tobacco. If you're really that anxious about your ability to sleep before and after, they can prescribe you something to help with that, simply making sure not to give you a enough that it would re-ignite your pill addiction.

Drinks on Thanksgiving is a different thing. You wouldn't want to drink a fifth of Scotch or show up at the hospital drunk the morning of your procedure, obviously, but a drink or two the day before will have been metabolized by your liver and not likely to interfere with your level of sedation the following day. I suspect that whoever has tried to frighten you about your levels of sedation and cannabis interaction doesn't know how fast it clears, either, or has it mistaken for a heavy narcotic.

Good luck to you!