Vaping without nicotine may not seem as harmful, but it's still bad news for your health. That's because e-cigs heat up a liquid containing chemicals, flavorings and other additives to create a vapor you inhale into your lungs. The heating process can release toxic chemicals like formaldehyde and acrolein, and the long-term effects of inhaling these unknown. Plus, the flavorings used can be harmful and have been linked to serious health issues.