Vaping has been one of the biggest health stories of 2019. The meteoric rise in popularity of e-cigarettes, combined with growing concern about their addictive nature, has preoccupied parents and regulators alike.

The craze took off largely because of one company, Juul, which reimagined the cigarette and cornered the vaping industry. In the process, it put a new generation at risk of nicotine addiction. This is a look at how we got here.