I think it's a bit of a stretch to imply that anti-anti-smoking detracts from the campaign against gun control. There is only so much time in the day so I suppose you could have a minor point. But I would also think that the cigarette odor could also help mask the smell of gunpowder; if I were a smoker I'd be less nervous getting pulled over.
The anti-smokers keep trying to turn it into a debate about smoking. That's where their strength is. From a health and hygiene standpoint, smoking's mighty hard to defend. Addiction's mighty hard to deny.
We have to deal with the social atmosphere in which we now find ourselves. And right now, privacy for people doing unwholesome things is practically exclusive to homosexuals and patrons of abortion clinics.