Most of Pennsylvania's high school and middle school students are tobacco-free, but the use of cigarettes, and their digital counterpart, e-cigarettes, is still a cause for concern, according to Penn State researchers.

The survey, which was given to students across the state in the 2014-15 school year, asked about which tobacco and nicotine products the participants had recently used. The most commonly used product by middle schoolers was e-cigarettes [...]