Estimating the causal effect of filter ventilation levels in cigarettes on past 30-day smoking.

Setting a maximum limit on filter ventilation (FV) in cigarettes could address the misperception that highly ventilated cigarettes are less harmful and the link between FV and lung adenocarcinoma. It is important to understand whether such a policy would have unintended consequences on longer-term smoking behavior. We found no strong evidence that FV affects past 30-day smoking 1-3 years later, but could not rule out the possibility that higher FV increases cessation rates. If future studies confirm these epidemiologic findings, this could mean that setting a limit on FV would not lead to reductions in the ability to quit smoking.