“…Table (2): Table displayed that, the majority (88%) of studied adolescents were not smokers, regarding their family history, more than one quarter (28%) of them their families had history of multiple sclerosis disease, more than three quarters (78%) had chronic disease, 20% and 22% of them had neurological and auto immune diseases respectively. Concerning past history of studied adolescents with multiple sclerosis disease, very few (4%) of them had collagen diseases, and 8% had Covid-19.…”