Pictured is a Juul, a type of e-cigarette which has become popular with teenager.

SLIPPERY ROCK — It's called “Juuling” these days.

The pastime that once was “vaping” — which was aimed at replacing smoking — is now named for the popular electronic-cigarette brand Juul.

Juuling is largely a term used by teenagers.

Teen usage of e-cigarettes is on the rise, according to the U.S. Surgeon General's website, with 20 percent of high school students reportedly using them in 2018.

Studies are starting to document the possible side effects of Juuling.

Slippery Rock University exercise science majors Megan Pesci and Julia Tremel are looking at the effects exercise has on the e-cigarette habits of students using Juul.

This is a preview of an article that appears in Friday's Butler Eagle. Subscribe online or in print to read the full article.