Some guy in my IOP quit cigs too about 30 days into sobriety. His realization was something along the lines of, "if I'm living healthier and cut out the booze, why the hell am I still poisoning my body with nicotine? Makes no sense." He seems a lot happier now that he's kicked the cigs and said he feels a lot healthier too. If you can quit drinking, you can quit cigarettes. On your new path, why would you possibly still want cigarettes in your life?