Vaping deaths: 'A new generation of nicotine addicts'
Doctors in the US are warning people not to use e-cigarettes as they investigate six deaths linked to vaping.
But health experts also say there's a long-term addiction crisis because so many American teenagers are already hooked on nicotine.
Produced by the BBC's Chelsea Bailey, Rod Macleod, Franz Strasser and Caché McClay.
