Counselling patients who smoke that they should discontinue cigarette use is the most effective approach to preventing acute bronchitis. In addition, there is some evidence that the use of vitamin A and vitamin D could reduce the risk of acute bronchitis and other respiratory infections.[9]Martineau AR, Jolliffe DA, Hooper RL, et al. Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant data. BMJ. 2017;356::i6583.
http://www.bmj.com/content/356/bmj.i6583
http://www.ncbi.nlm.nih.gov/pubmed/28202713?tool=bestpractice.com
[10]Ginde AA, Blatchford P, Breese K, et al. High-dose monthly vitamin D for prevention of acute respiratory infection in older long-term care residents: a randomized clinical trial. J Am Geriatr Soc. 2017;65:496-503.
http://onlinelibrary.wiley.com/wol1/doi/10.1111/jgs.14679/full
http://www.ncbi.nlm.nih.gov/pubmed/27861708?tool=bestpractice.com