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If I am recalling correctly: I think when the initial lawsuit happened a bunch of tobacco companies had to put money into a research fund. And a few companies have funded some independent studies. But I don't know if any tobacco companies regularly pay a portion of their profits to research anymore.
@CestManan Part of the reason the government has an issue with it is that second-hand smoke is more detrimental in and of itself than the filtered smoke that goes into a smoker's lungs, so people who are around cigarette smoke but do not smoke are getting sick/cancer more frequently than smokers. Frequently these long-term illnesses make the ill individual unable to work which makes them reliant on Medicaid/Medicare which is paid for by taxes.