Robert Chan lit his first cigarette aged 18. He quickly became hooked, smoking 15 a day for more than a decade. [...] Two years ago, on his 30th birthday, Chan started using a device that heats tobacco -- instead of burning it -- to release a nicotine-laced vapor.
Chan is one of the 35 million people around the world believed to be using e-cigarettes or heat-not-burn products, according to Euromonitor.
"I wanted to stop smoking but I wasn't quite ready to quit nicotine yet," he says. [...]