No sh!t.

Because of the addictive additives inside your smoke.

electronic cigarettes are harmful because of the nicotine but, they

are not as harmful as regular cigarettes because they don't have all the tar and extra additives to them.

Filtered cigars have many of the same additives as cigarettes. Even so, if you do not inhale the ill health effects are diminished.

Not nicotine yo.

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Indeed. Cigarette makers are not required to list the chemical additives in their cigarettes, but anecdotal information on the increased difficulty in quitting them v unadulterated tobacco suggests that it may not be nicotine.