This is an older article, but probably still pretty relevant:
American Smokers and Income, Charted - NYTimes.com
You are probably right in your observation about more successful people being less likely to be smokers. But if there are any smokers on the forum, they probably needn't worry... I'd be willing to bet that there isn't a casual relationship between those two factors (i.e. not smoking doesn't lead to a higher probability of success and deciding to smoke won't hinder your probabilities of success.).