China is taking steps to regulate its blossoming vaping market as health concerns over electronic cigarettes increase.

China’s National Health Commission has begun research into e-cigarettes and plans to issue legislation for the industry, said the head of the health authority Mao Qunan at a press conference this week. The attempt came as Chinese e-cigarette startups raised loads of venture capital over the past year in their fight to vie for attention in the world’s largest market of smokers.

Vaping suppliers in China range from little-known workshops that have come under legal attack from industry giant Juul, which is reportedly mulling a China entry itself, to venture-backed startups operating out of manufacturing hub Shenzhen. At least 20 e-cigarette companies in China have raised fundings since the beginning of 2019, according to data collected by Crunchbase.

These players are in effect up against state monopoly China Tobacco, which is the world’s biggest cigarette maker and provides the government with colossal tax revenues.

Some researchers support the use of vaping to help adults quit smoking while others have shown that e-cigarettes are just as addictive as traditional ones. The other major controversy is the growing use of e-cigarettes among teenagers, which has led to California’s plan to ban vaping product sales.

China is also applying more scrutiny to the new smoking technology. Research shows that the aerosol produced by heating up e-cigarettes can contain “a lot of harmful substances” and additives in e-cigarettes can “pose health risks,” said Mao. He also noted that equivocal labeling of nicotine levels can misguide smokers and sloppy device standards can result in battery explosions and other safety incidents.

Like the U.S., China has seen a worryingly high vaping rate among young people, which is another reason that urges Beijing to hold the industry in check. The use of e-cigarettes by kids, teens and young adults has been proven unsafe because nicotine, which is highly addictive, can harm brain development.

In May, China drew up a set of standards (in Chinese) for e-cigarettes that specify the level of nicotine, the type of additives and other components and designs allowed in battery-powered cigarette devices.