The article originates from a study made by University of Hong Kong, as opposed to anywhere in mainland China. Hong Kong enjoys a certain amount of autonomy from the Chinese state, having previously been a UK colony (we won it in the 2nd Opium War, a war FOR drugs) It's a powerful economic hub, and generates a lot of wealth for their economy.
As such, it is allowed certain freedoms not enjoyed in other Chinese provinces (like relatively free internet use, and being able to complain about things without being run over by a tank
) as shown by the demonstrations and public protests last year about Beijing's attempt at electoral reform there.
China is set to become the largest world economy in a few years, and they have form when it comes to putting profit above public safety/health concerns/workers rights/almost everything else.
While that certainly isn't a good thing (Really China? working people till they drop (off a building)?) as long as the industry remains lucrative, I wouldn't imagine
they'd ban Vaping gear over a report from a province considered an upstart by the 'Inner Party'...