I smoke the occasional cigar (even purely unadulterated ones). The key is moderation.
Really though, I find that those who start smoking tobacco do so as a result of lowered inhibitions from alcohol. Then, the addiction takes hold because they're smoking every time they're drunk and they get drunk often enough for it to be a problem.
Cigars are legit amazing when you're drunk. That small amount of nicotine getting into your system (or large amount if you're getting the smoke in your lungs) DOES give you a buzz. The buzz you get goes great with your alcohol buzz. Compared to the flavor of alcohol, cigars are pussy shit on the taste buds.
So... there you have it. All your questions regarding people's motivation for doing things are from your lack of experience with them. Live a few more years and your questions will be eventually answered. ; )