Images wrote...
Glad to know I disgust you and that my actions should be damned.
I'm a smoker and though I may give up when I'm having kids I ENJOY it. People aren't just mindless slaves to it, they LIKE doing it.
I agree with the book's statement of the illusive man's opinion that smoking is something ancient and important in the evolvement of human interaction, from peace pipes in the Native American tribes, to hookahs in the middle east, to the cigar at a wedding and a baby's birth, to the late night cigarettes filling a room during an argument in the war room of the white house. It has a connection to how we interact wit the world. Is it a good habit? Hell no. Neither is drinking, which I enjoy too (aren't I disgusting) and is also a major part of socializing for several cultures including my own beloved British pub mentality. People disagree with both these habits but people still enjoy them and feel that they shouldn't be told what to do with themselves.
This is at the core of Illusive Man's character, he cannot and will not be told what to do by anyone. He will enjoy and celebrate what is part of human existence and culture with no limits to the purity of the act, going as far as to get the tobacco and whisky from its original sources.
The fact that they are both now harmless in the ME future also helps. No matter how DISGUSTING we smokers are, I'm pretty sure a hell of a lot more of us would exist if there was no health gamble. If that wasn't true, then non-smokers wouldn't constantly try to bum smokes off me every time alcohol has caused their inhibitions to slide. 
You must be a seasoned veteran of the assorted smoking debates. I'm impressed.
You did hit on some key points that easily get overlooked. Me, I'm a smoker, and I grew up around family with easy 2 pack a day habits with some having started when they were 10. Yet despite being around all these smokers, I didn't start until I was in my late 30s, and it's about 5 cigs a day tops. You'd think I would've started sooner in light of the misconception of being around it so much somehow imparts the mental compulsion. Hell, I'm even surprised no one's died from cancer or got emphysema yet.
But that misconception abounds even in other things. Listen to heavy metal music and it turns you into a Satanist. Watch too many fast food commercials and you're almost hypnotized to immediately run out to the nearest crappy burger joint. Play violent video games and they you into a homicidal maniac ready to kill at the blink of an eye...etc...
Really, listening to heavy metal just lead to the start of hearing loss, fast food commercials at the most just have me turning the channel much less getting out of my chair, and working retail for as long as I did probably contributed to any violent urges I've had more than any videogame beyond kvetching at a difficult part.
I swear, it's like some can't comprehend that free will thing and that it's going to mean some doing something they can't stand. They'll kick up thier fusses, push through enough bans and legislations, demand all portrayals be stricken from the public eye, but it still boils down to if people want to do something, they will until they decide on thier own to stop.