Habitual use of e-cigarettes may harm the heart, reports the Washington Post.

The study involved 42 adults with an average age of 28. Twenty-three had used e-cigarettes — vaped — daily for at least a year and 19 had never vaped.

All participants had no known health problems, were taking no prescription medications and did not smoke tobacco cigarettes. Electrocardiograms and blood tests were used to evaluate their heart activity. E-cigarette users were found to exhibit physiological effects not present in the nonusers, such as abnormalities in cardiovascular function that included higher oxidative stress levels and levels of adrenaline in the heart, an effect known as increased cardiac sympathetic activity. These factors are known to increase the risk of cardiovascular problems.

Read more at www.washingtonpost.com