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I don't think that social class ever went away YMB ! Its just that we define it differently these days. I know from first hand experience, that incidents of smoking increases as you go down the social scale. Its mostly to do with education and upbringing.
What worries me though, is that smoking still seems to be popular with the younger generation, especially with school-age kids and especially with girls.
When I was a boy back in the 60's, most people smoked, especially from working-class backgrounds, and I and my brothers all smoked. But none of us still smoke now, although I have 2 nieces who do !