The findings suggest that smokers who have high levels of a protein that protects against the Epstein-Barr virus, a common herpes virus, were twice as likely as nonsmokers to get multiple sclerosis (MS), the researchers wrote in the online edition of the journal Neurology.
http://www.reuters.com/article/idUSTRE6365I120100407
Smoking may increase risk of multiple sclerosis: study
(Reuters) - Smoking may increase the risk of multiple sclerosis in people who have other risk factors for the neurological disorder, researchers said on Wednesday