Fans of Juuling often say it's much safer than smoking tobacco, but are nicotine vaporizers actually safer than cigarettes? Yes and no, according to scientists who are still very wary of Juul and other e-cigarettes.

Unlike cigarettes, Juul does not involve combustion. That means your lungs won't be exposed to carbon monoxide and other harmful toxins found in smoke. Cigarettes also contain hundreds of chemicals that have been linked to causing cancer.