What is worse to smoke Marlboro reds or menthol smooths?

All filtered cigarettes, regardless of "strength", pose the same health risks; non-filter cigarettes, however, increase a user's risk of lung cancer more than filtered varieties. There is some speculation that menthol cigarettes are more harmful than non-mentholated varieties, as users of menthol cigarettes tend to take deeper and longer inhalations due to menthol's perceived "cooling" effects on the throat and chest. With that said, Marlboro Reds are probably less harmful than Marlboro Smooths, albeit the difference is negligible.