Researchers in Finland found a link between smoking and subarachnoid hemorrhage (SAH), a type of bleeding stroke, in a study of more than 16,000 pairs of twins over 42 years. The study found that bleeding in the brain can be explained to a greater degree by environmental risk factors, such as smoking, than by genetic influence.
from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/09/200917084557.htm
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