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Multiple Sclerosis Multiple sclerosis (MS) is primarily a neurodegenerative disease that is caused by chronic inflammatory demyelination of nervous tissue in the brain and spinal cord (Rothhammer and Quintana 2015)

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Heavy or chronic users accumulate higher levels of cotinine, detectable for up to 3 weeks, while occasional users have levels detectable for approximately 4 days

Women should stop smoking before pregnancy and certainly during pregnancy, Gupta advised