Researchers from West Virginia University in Morgantown report that exposure to e-cigarettes had a deleterious effect on the cardiovascular health of mice.

The study found that within an hour of being exposed to 5 minutes of e-cig vapor, the arteries narrowed by 31 percent. Chronic, long-term exposure to e-cigs also resulted in aortic stiffness, which was two and a half times higher in that group compared with the control group, which was exposed to filtered air only.

Furthermore, acute exposure also resulted in a 9% decrease in vasodilation. The maximum aortic relaxation that was achieved in reaction to metacholine was 90% in the control group, but this reduced to 70% in the chronic e-cig exposure group.