Health effects in COPD smokers who switch to electronic cigarettes: a retrospective-prospective 3-year follow-upNovember 13, 2019November 13, 2019https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6113943/Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Name * Email * Website Comment * Save my name, email, and website in this browser for the next time I comment. ΔThis site uses Akismet to reduce spam. Learn how your comment data is processed.