It's getting worrying. There is little research into the long term effects. It seems to have risen from less than 1% of teens using them in January 2021 to over 50% in a year. Each elf bar has the equivalent nicotine of 50 fags!! My teenage son thankfully has body swerved them but says virtually every girl he knows is addicted to them, even having sly puffs in the class room. They are advertised everywhere with juicy sounding flavours, marketed at the young imo and not much is being done about it.