I'm a college student who used to live in South Korea, which is horrible in its regulation and tax law against vaping. First, South Korean government collects 400 won (which is converted to about 40 cents) per 1mL of e liquid that contains any level of nicotine, which is CRAZY. People pay around 20 to 30 dollars for a 20mL bottle, (not a 30mL bottle - 20mL bottle is the norm there) of NO-Nicotine e juice, because that's what vendors charge, and they buy unflavored nicotine bottles separately and mix them together themselves before they vape, since it's cheaper that way because of the 40 cents per 1mL of nicotine-contained-liquid law. Furthermore, people cannot purchase e liquids from internet because of the law prohibiting such purchase, and they have to go to local vape shop to buy, which ultimately limits the variety of e juices they can try. DIYing e liquids is illegal, but people do it anyway to some extent, as strictly saying, mixing 0mg e juice with concentrated nicotine is DIYing also, and usually there's really no way of knowing if someone's mixing e liquids or not. However, selling the DIYed e liquid is strictly prohibited, which means the plethora of e liquid vendors in US, who starts their business in small scale by selling privately created e juices to other people, would never be possible in South Korea. Still, there are many vapers in South Korea, whom are furious with the laws, of course, but really they can't do anything about it since the law had passed ALREADY. US still has a chance before something like this happens, because if we don't act, something like what happened to South Korean vapers will happen.