According to Dr. Stan Glantz - a leading tobacco control researcher - cutting down substantially on the amount you smoke has no health benefit. Thus, according to Dr. Glantz, smoking two packs of cigarettes per day is no more harmful than smoking a half pack per day, for example.

The authors admit this in the paper. They write: "This is a cross-sectional study, which only allows us to identify associations, not causal relationships."

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