A person in Santa Rosa rolls a joint in 2016. A UCSF study of regular marijuana users found an unexpected result on heart rhythms. Eric Kayne/For the S.F. Chronicle Regular marijuana users had fewe…

A person in Santa Rosa rolls a joint in 2016. A UCSF study of regular marijuana users found an unexpected result on heart rhythms. Eric Kayne/For the S.F. Chronicle Regular marijuana users had fewe…


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