E cigarettes: Facts, stats and regulations Let's talk vaping. Smokeless doesn't mean harmless. Most e cigarettes contain nicotine which is highly addictive and can harm adolescent brain development, which continues into the early mid 20's. Some e cigarettes can even Differences Between a Vape and a JUUL by Kashif Bashir Medium Juul disregarded early evidence it was hooking teens Juul can continue selling e cigarettes as FDA says vaping benefits outweigh risks PBS News