Frequent teen vaping might boost risk of toxic lead and uranium exposure BMJ Group Many students believe that vaping harmless, which is far from the truth. Vape pens can contain potentially harmful substances such as chemicals linked to lung disease, cancer causing chemicals, heavy metals such as Vapes on black market may contain toxic chemicals, pesticides, harmful flavorings Mississippi vape law leads to ingredient changes Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis