Smoking and multiple sclerosis risk in black people: A nested case-control study.

Area of Science:

• Neurology
• Epidemiology
• Environmental Health

Background:

• Smoking is a known risk factor for multiple sclerosis (MS).
• The impact of smoking on MS risk across different racial and ethnic groups remains unclear.

Purpose of the Study:

• To investigate whether smoking affects multiple sclerosis risk differently based on race/ethnicity.

Main Methods:

• A nested case-control study was performed using serum samples from US military personnel.
• Serum cotinine levels (a marker for tobacco smoke exposure) were measured in Black and White individuals who developed MS.
• Controls were matched by age, sex, race/ethnicity, sample collection dates, and military branch.

Main Results:

• Smoking was not associated with an increased risk of MS in Black individuals (RR: 1.08).
• The association between smoking and MS risk in White individuals was not statistically significant (RR: 1.85), but the point estimate aligns with prior research.
• Results remained consistent across various analyses, including different smoking status definitions and sample timings.

Conclusions:

• The association between smoking and multiple sclerosis risk may vary by race/ethnicity.
• Smoking was not found to be associated with MS risk in Black individuals, contrasting with findings in predominantly White populations.