When can I start smoking after tummy tuck?

Hi there-
Even though it sounds like you have done well for the first two weeks since your tummy tuck, I would not want you to believe that you are "out of the woods" with regards to the risks posed to your recovery and outcome by nicotine.
Please note that I have phrased the above very deliberately, because it is the nicotine, and not the smoke that is dangerous to you in this situation. Nicotine causes the small blood vessels throughout your body to constrict, limiting blood flow, and compromising healing- and for this reason, gums and patches are just as dangerous to your result and healing as a cigarette is.
Also, human wounds heal in exponential fashion for the first 6 weeks, so in the big scheme of things, you are really not very far along in the process. Any smoking at all might cause compromise of your healing, which could result in your needing to pack bandages in the wound for months, or worse, it could cause the death (necrosis) of some of the skin near the incision, which might take even longer to heal and leave you with a scar you will wish you could have prevented. Indeed, these risks are the reason many plastic surgeons won't consider doing a tummy tuck on a smoker.
While I'm glad that you have done well so far, I recommend you put any thoughts of cigarettes out of your mind for at least another few weeks. You've made a big investment in your body and appearance, and I know you wouldn't want to jeopardize that investment for the short term pleasure of the cigarette.
Hang in there, be strong, and DON'T SMOKE!

Each surgeon has their own instructions on smoking after surgery. Please follow your surgeon’s as they're more familiar with your situation.

Smoking can play a big factor in inhibiting the body's healing process. It is strictly advised to try and eliminate smoking ( especially cigarettes), four weeks prior to surgery as well as for at least four weeks post surgery. Smoking will cause major damage to the blood vessels which will then decrease the amount of blood flow to any wounds you have. Smoking also will decrease the amount of oxygen in your blood. To avoid risk of infections, complications and prolonged healing process, you should speak to your healthcare provider about options to help you quit smoking. A lot of Cosmetic Surgeons may even deny doing surgery if you do not quit.