(CNN) Illinois is the latest state to file a lawsuit against e-cigarette maker Juul, alleging the company undid "years of progress made to reduce youth smoking rates."

The lawsuit, filed by Illinois Attorney General Kwame Raoul on Thursday, alleges Juul used a "sleek, easy-to-conceal e-cigarette" combined with fruity flavors that masked a less harsh nicotine solution that it marketed to minors.

Juul's e-cigarette device resembles a USB flash drive, can be charged via a USB port, and can be used discreetly, all features that make Juul's device more appealing to youth, according to the lawsuit. It cited a recent FDA study that showed a sharp increase in the number of high school students using e-cigarettes from 2017 to 2018.

"Juul had a central role in undoing years of work by government agencies and anti-tobacco activists in order to addict a whole new generation to nicotine," the lawsuit states.

Juul hasn't reviewed the complaint yet but has been "focused on resetting the vapor category in the U.S. and earning the trust of society by working cooperatively with attorneys general, regulators, public health officials and other stakeholders to combat underage use and convert adult smokers from combustible cigarettes," Juul Labs spokesman Austin Finan said in a statement to CNN.