As I understand it there was multiple "vaping" device invented many years just before Ruyan at any time mass developed an e-cigarette, quite possibly the most famed one being the a single within the patent pic below from Herbert Gilbert. The reaction is rather understandable, as I have

Also be sure to do YOUR study on PEG400 I did. I'd under no circumstances recommend it to someone without analysis. Good luck you will work it out.. I don't brain a lot of if the flavors are confined, as my major concern is getting something to smoke that is fewer hazardous than cigarette