New research estimates that 4.5 percent of adults in the U.S. currently use e-cigarettes. That equates to more than 10.8 million e-cigarette users, most of them — 51.2 percent — under the age of 35 and about 60 percent are men. Those data come from an analysis of national self-reported health behaviors.
Additionally, e-cigarette use was higher among people who were lesbian, gay, bisexual or transgender, as well as in the unemployed and those with cardiovascular disease, asthma and cancer. It was even higher in those with chronic obstructive pulmonary disease and depression.