Smoking...ugh...such an obvious sign of a weak will, and low self esteem.
No one needs to smoke, it's a given fact. It's not a health requirement, even if you have high blood pressure (There's a pill for that that isn't addictive, nor bad for you), or if you have a bad day, or anything. There is no real excuse I can think of that is believable. People smoke, from what I gather, because they either A) Think it's "cool", B) Because others do it, or C) Because they're curious.
Living for sixteen years of my life with a chain-smoker kills any sort of curiosity towards that. It isn't cool when your lungs turn out looking like a pile of rotted meat, and I have no qualms with being the only one in a group who doesn't smoke. Hell, I'd be proud to be that person...well, provided I'm forced into spending time in the same square mile as them.
I just...ugh. I don't understand why someone would want to. Comradarie? Bullshit. Just go up to them and fucking talk. You shouldn't need to ruin your health with a stick full of who-knows-what being inhaled into your lungs to get that sort of companionship with others. If you do, then you're one sorry socialize-er.
Small consolation prize for you, though: You don't care what anyone thinks, and will keep on doing it despite what others say because it is something you enjoy. Great concept, bad usage. That's like saying that you'll just keep driving shards of glass into your nose because it's something you enjoy. It's great that you enjoy it, now if only it wasn't something that's killing you faster than the daily rigors of life, plus annoying the hell out of everyone around you who is smart enough not to smoke. :\
End of line.