I am not a regular smoker, but I have tried it on occasion, and even though I don't smoke I really don't have a problem with people doing it if they want to.
1. It's important for people to understand just how much propaganda there is out there about drugs. Adverse health effects are almost always massively exaggerated, or they use anecdotal evidence because they know it scares people. The vast majority of drugs that are illegal or viewed as dangerous are perfectly safe if used in moderation and under reasonably safe conditions (smoking crack in a back alley in a bad part of town at night is a bad idea, but even without the crack just being in a back alley in a bad part of town at night would be a bad idea). The problem is that many people today don't understand the concept of Moderation. If you smoke a pack of cigarettes every day, that is a LOT of smoking, and it will be unhealthy. If you drank a 2-Liter of soda every day, it would also be unhealthy, maybe even more unhealthy. If you do anything too much it will hurt you or screw up your life. Drugs will do to you what you do to them--if you use them responsibly and respectfully, they will give you a lot of joy and maybe even some enlightenment. If you abuse them, then they will abuse you.
2. The first time I really smoked was a cigar (a few puffs of cigarettes and pipes here and there doesn't count). It was pretty cool for about the first 1/4 of the cigar--I felt really warm and happy, a little like being drunk but also a little different. I really enjoyed it. But when I had smoke 1/2 of it I started feeling really weird and unpleasant, so I stopped. It was a few hours before I felt normal again, and until then I felt like I had a hangover--nausea, headache, and aversion to most stimuli--but at least with a hangover you generally feel like sitting still and trying to sleep it off. With the cigar I was wide awake and wired in addition to all of the above. Not a fun time for me, but that's probably because I smoked too much at once. If I do it again I'll know to take it a little easier.
3. As I said, the only time I really smoked was a cigar. It was pretty nice--nice flavor, and I didn't have to inhale it to get the effect. I could see someone really getting into it, just like a person might really get into wine, and that's actually how a lot of people view it. Cigars are the wine of smoking, while cigarettes are the beer. Some people prefer one form over another and enjoy the experience of one as opposed to the other. But chemically they do the same thing to you. Cigars are @$#%-ing expensive, though, so if you smoke them make sure you enjoy it enough to get your money's worth.