They snap their teeth on your cigarette.

If you think it's better, it's not.

Edit

To clarify...

If you're a smoker and you downgraded to vaping, it's a step in the right direction, but still you're better off quitting. We know the addiction is hard to quit, but vaping is a better alternative than actual smoke inhalation.

But if you've never smoked and started vaping (most likely due to advertisements and/or peer influence), the long-term effects of vaping are still inconclusive. That said, you are still inhaling toxic chemicals, especially through the delivery method (propylene glycol, vegetable glycerins), not to mention other flavorings, and depending on the device, possibly metals from the heating elements. While it isn't as bad as cigarettes, the best course of action would be to remove yourself from such an addiction before it becomes a problem.

Or, you could just go on believing you're safe, continuing to inhale. I'm not going to judge you, but Nature will. Biology is funny like that.