> In this study, researchers exposed rats for eight weeks to a single daily session of exposure to Marlboro Red cigarette smoke, aerosol ("vapor") from the popu

> In this study, researchers exposed rats for eight weeks to a single daily session of exposure to Marlboro Red cigarette smoke, aerosol ("vapor") from the popular e-cigarette JUUL, aerosol from the heated tobacco product IQOS, smoke from marijuana cigarettes, and smoke from modified marijuana that lacks all cannabinoids, compared to just air. But not e-marijuana (aka vape pens). Seems like an oversight?