The study was conducted by the University of California, San Francisco.
The findings were published in the journal Nicotine & Tobacco Research.
The study, conducted in mice, suggests that second-hand smoke exposure alters cells that regulate how the heart beats.
The largest health burden from substance use was attributable to tobacco smoking and the smallest was attributable to illicit drugs.
A sharp spike in vaping by students has grabbed the attention of the FDA.
Studies show an increased risk of psychosis among marijuana and tobacco smokers.