About one in five King County high-school seniors reported using e-cigarettes or vaping in the past month, a county report shows.

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E-cigarette use among King County teens has risen sharply in recent years, even as fewer kids are smoking cigarettes and drinking alcohol, new figures from county health officials show. Marijuana use has remained about the same.

Nearly 22 percent of high-school seniors reported using electronic cigarettes or vaping in the past month in 2014, up from just 3 percent in 2012. Among 10th-graders, more than 14 percent had used e-cigarettes last year, up from 2 percent in 2012.

That’s according to preliminary results of the biennial Healthy Youth Survey, which included more than 13,000 King County young people who participated in October 2014, according to officials at Public Health – Seattle & King County.

The rise in e-cigarette use could stem from an assumption that the devices — which allow users to inhale nicotine-infused vapors — are safer than conventional cigarettes.

“Nicotine, whether consumed in a traditional cigarette or an e-cigarette, is addictive and dangerous,” Patty Hayes, interim director for Public Health – Seattle & King County, said in a statement.

The e-cigarette question was added to the survey in 2012. For other questions, investigators compared the new results with 2008 figures, to ensure stability.

Cigarette use among 12th-graders fell to 10.5 percent in 2014, from nearly 19 percent in 2008, while the practice declined by half for 10th-graders, to 6.5 percent in 2014, from nearly 14 percent in 2008.

More than 31 percent of seniors reported they had consumed alcohol in the past 30 days in 2014, down from 41 percent in 2008. Among 10th-graders, the figure fell to 19.5 percent, from nearly 29 percent in 2008.

The use of marijuana or hashish in the past month was nearly 26 percent among 12th-graders in 2014, down slightly from more than 28 percent in 2008. Among 10th-graders, nearly 17 percent used pot or hash in 2014, down from about 18 percent in 2008.

Illegal drug use also declined, the survey found. About 6.5 percent of seniors in high school reported any use of illegal drugs in 2014, down from nearly 10 percent in 2008. Among 10th-graders, nearly 5 percent reported using illegal drugs in 2014, down from nearly 7 percent in 2008.

The Healthy Youth Survey is taken every two years in Washington state by public-school students in grades six through 12.