According to Northerner, countries including Singapore, India, Thailand and Qatar have significant restrictions on e-cigarettes
The main components of a vape pen are the battery, heating element (atomizer), tank or cartridge, and the mouthpiece
doi:10.1111/j.2042-7158.1994.tb03871.x
Canaries in the Mine Symposium 2003 and 2005, FAMRI Annual Scientific Symposium November 30 through December 2, 2004, San Francisco Airport Museums, San Francisco, CA Up in Smoke Exhibition 2003 World Conference on Tobacco or Health, Helsinki, Finland September 15, 2004 through March 15, 2005, San Francisco Airport Museums, San Francisco, CA Reproduced in print, Tobacco Control, March 2005, Vol