QuickStats: Cigarette Smoking Status Among Current Adult E-cigarette Users by Age Group — National Health Interview Survey, United States, 2015

In 2015, 3.5% of U.S. adults were current e-cigarette users.

Among adult e-cigarette users overall, 58.8% also were current cigarette smokers, 29.8% were former cigarette smokers, and 11.4% had never been cigarette smokers.

Among current e-cigarette users aged 45 years or older, 98.7% were either current or former cigarette smokers, and 1.3% had never been cigarette smokers. In contrast, among current e-cigarette users aged 18–24 years, 40% had never been cigarette smokers.

Source: https://www.cdc.gov/mmwr/volumes/65/wr/mm6542a7.htm