It is bad to smoke cigarettes regardless of two cigarettes in a row or single cigarette. Smoking is an independent risk factor for heart attacks.
If you saw my grand dads death at age 72 due to cancer from smoking , none of us would be smoking , i know i am a smoker , i quit 2 years and started back up early 2010 winter just sad and depress i guess
Having one is itself harmful, then you guess about having two.
I think SMOKING is bad so it's does'nt matter how many cigarettes u smoke