I smoked (and still, do, unfortunately) even with SRS.
I tried stopping right after my surgery, 'cause I was in bed anyway. Although, after two days even Dr. Brassard told me to go have a smoke 'cause the stress of trying to stop at the same time of having my surgery was too much stress on my body.
So, basically, if you're gonna quit, try to do it before you have surgery. Be warned, that after surgery you'll probably have an urge to smoke. I know I did, and smokes tasted really gross with the medications I was on, but the stress of not smoking at the same time was making me really sick -- ironically, smoking made me feel better and I started healing and having less pain. Dr. Brassard said it was related the the stress of the two and a few smokes wouldn't hurt me and would help with the healing.
I know, it sounds weird, but stopping smoking also puts your body through stress. Before surgery, if you can't quit, try to get under 10 smokes a day. I got to around 8 a day. After surgery, just slowly cut down if you can, 'cause cold turkey would put more stress and you'll feel more sick then you would be normally.
I've had no issues with HRT and smoking what so ever. Not that smoking is good for you, but in my case it hasn't been a huge issue. Then again, I'm a light smoker. I smoke lights and always under 10 a day. For HRT I'm on estrace and prometrium.
I'm just over a year post-op.
Anyway, congrats on your surgery. Quit when you are ready. But remember that quitting will also put your body in stress and if you're only two weeks post op, quitting cold turkey would be a bad idea -- if you're only on half a smoke a day, the smog in the air is worse than that.
My only pet-peeve is people who've never smoked before and decide to go on a soap-box and tell me how awful I am, and all of the horrible stuff smoking is going to do to me. Really? Wow? Like I didn't know that already. That's kinda like telling a sinner that they are a sinner and going to hell -- it's not encouraging and it ain't gonna make someone stop. Being a smoker doesn't mean your stupid or dumb.
Quit when you are ready and determined. Don't put yourself down for it. Find daily encouragement. And remember, it's not a bad thing if you start up again, you just try again -- don't beat yourself up over it (or let others beat you up either for it).
I hate it when people soap box me. In fact, I stopped going to the local trans support group because the leader (or what ever she is) and a few others decided to soap box me, tell me sht I already knew, and made me feel like complete garbage. And I thought that it was a "support" group for trans people, not a "beat up the smoker group." I felt so unwelcome I ended up crying after the "support" group. Moral of the story, soap boxing doesn't help.
Anyway, i wish you good luck.

--natalie