You figure you'll test out your powers and see if you can make vaping more interesting.
First you replace most of vaping old side effects with a new one. Anyone who vapes even once will have their body turned into that of a sexy young woman and with every puff their sex drive will slowly rise well their personality becomes more slutty. This will all be seen as normal and people will be just as likely to be dissuaded by these new side effects as they were the old ones.
You finish up with your changes and look around both around the city and online, and are happy to see that everyone currently vaping was a gorgeous woman.