Thai Law prohibits E Cigarettes being bought into the country.
In November 2014, Thailand approved legislation outlawing the import of e-cigarettes into the country. This has since been expanded to the export as well as sale of e-smoking devices and equipment. Although it is common to see people vaping in Thailand offenders are technically breaking the law as possession is illegal.
The Foreign Office Website includes a paragraph stating “You can’t bring vaporisers (like e-cigarettes and e-baraku) or refills into Thailand. These items are likely to be confiscated and you could be fined or sent to prison for up to 10 years if convicted. The sale or supply of e-cigarettes and similar devices is also banned and you could face a heavy fine or up to 5 years imprisonment if found guilty. Several British Nationals have been arrested for possession of vaporisers and e-cigarettes”