Key clinical point: No amount of smoking appears to be safe.
Major finding: Former smokers had an increased yearly decline in FEV1 of 1.82 mL.
Study details: Cohort study of 25,352 smokers, former smokers, and never-smokers.
Disclosures: The study authors report personal fees, consultancy fees, or grants from a wide variety of pharmaceutical companies.
Oelsner EC et al. Lancet Respir Med. 2019 Oct 9. doi: 10.1016/S2213-2600(19)30276-0.