Smoking 2 Cigarettes After the 3th Treatment?

Smoking two cigarettes should not cause concern for adverse healing post-procedure.  I do not recommend continuing to smoke.  Do not worry about the two cigarettes  Stay well-hydrated, eat healthy, apply adequate sunscreen, and use physician prescribed skin care. Thank you

In general two cigarettes will have no effect on  your over all healing from a CO2 laser treatment.  You should follow you physicians post operative instructions carefully to optimize your final result. 

Smoking two cigarettes will have no affect on your healing - positive or negative. It's not good for general health, but it won't affect your fractional laser results.