Korea does not punish buyer yet. We divide
vaping in 2 kinds, NIC or NIC FREE. So,
vaping hardwares are not subject to any regulation here. You may walk with in hand in open places anytime. Possession, purchase or distribution is open to all.
With same reason Nic-free juices are open to all.
Only when Nic is added to juice or Nic is nic itself(a pure nic), it is subject to law of tobacco distribution. they need special pepers to sell(not to buy, you may buy as long as you are 19 of age or older) If you are 17 and someone sell NIC to you, he/she will be punished.
Today's problem is it became very hard to get pure nic since Jan 1 this year. Government insisted we need to "legalize
vaping for national health". So they did it, blocked buying nics asking for tons of papers and "IQOS" appeared on market.
If your gov tries to make some action, please notice they do it for their money instead for your satisfaction.