I would expect that smoking is particularly bad for a T2 diabetic, because of the effect on blood vessels and blood circulation. As someone who struggles greatly with my weight, it has crossed my mind at times that smoking might be the lesser evil, and if I could just live off cigars and coffee, I might be better off. Alas, I'm sure this wouldn't work: I have had heart trouble after T2 diagnosis, and pretty much the only blessing I have is clean lungs from not smoking (I quit cigarettes in my early twenties). Everything else I have- bad circulation, neuropathy, stenosis, high blood pressure- it would have all been exacerbated by smoking, particularly cigarettes. To be fair, I'd probably still rather have a cigar than a bowl of oatmeal, but if you can give up smoking, I'd say it would be a worthwhile sacrifice for your health.