It is however annoying when the addict does their thing in public with zero fucks to give for anyone else around them.
Check out Allen Carr's Easy Way to Stop Smoking, if you're interested. It helped me think a lot more about what I was doing and feeling, and turned out to be useful in a bunch of other areas in my life. I found the audiobook ripped from cassettes as a torrent.
The surprise on my end is usually that new people smoke. Anyone that had already developed the habit, I am not surprised still does it. In that regard, it is not unlike any other drug.
I also realize I should count myself incredibly lucky that smoking does not impact me at all. I literally feel nothing when I try a smoke or cigar. Can barely even taste it. Reminds me of my grandfather who used to smoke to be social. When he found out they were bad for you, he just stopped. Had no withdrawal at all. Yay genetics. :D
Granted, using smoking as an example is hilarious to me. I confess near zero sympathy for that going away. If anything, I'm pretty sure I'm more dumbfounded that people still smoke in any real numbers.