As I understand it there was multiple "vaping" device invented a long time just before Ruyan ever mass manufactured an e-cigarette, quite possibly the most famous 1 staying the just one while in the patent pic beneath from Herbert Gilbert. OTOH, vaping strike Europe around 2005 and NA about 2007, https://erickundtu.blog2learn.com/82742109/the-smart-trick-of-is-it-illegal-to-buy-thc-vapes-online-that-no-one-is-discussing