Be A Vape Free Teen Cecil County Health Department Vaping vs Smoking vs IQOS: Which is Least Harmful? Myth: Vaping is harmless. Fact: Vapes contain nicotine and other chemicals that can harm your lungs and make it harder to quit for good. In California, vapes are now one of the Disposable vapes might look harmless with their fun colors and sweet flavors, but scientists have just uncovered a disturbing truth: these devices can pack a toxic punch even stronger than regular cigarettes.