Recent study showed that smoking before age 17 increases the risk of developing multiple sclerosis. Research team led by Joseph Finkelstein, MD, PhD, at Johns Hopkins University School of Medicine in Baltimore studied data collected from 87 patients with multiple sclerosis (MS).
The study subjects were divided into three categories: nonsmokers, early smokers who started before age 17, and late smokers who started at 17 or later. Research team also studied factors like sex, race, age, marital status, education, income level, and region.