One study found that 45.2 percent of surgeons surveyed in China were smokers.

— https://www.frontiersin.org/articles/10.3389/fpubh.2020.00177/full is a 2020 China research

In male participants [smokers, presumably], the daily cigarette consumption was 17, and the mean age of smoking initiation was 21, and becoming lower over the years. (Recent decades have seen younger starters among smokers, perhaps due to wider accessibility.)

— https://www.who.int/china/health-topics/tobacco

There are more than 300 million smokers in China, nearly one-third of the world’s total. More than half of adult men are current tobacco smokers. In addition, over 700 million non-smokers in China, including about 180 million children, are exposed to second-hand smoke (SHS) at least for one day in a typical week.

— https://www.ox.ac.uk/news/2015-10-09-smoking-set-kill-one-three-young-men-china

Two-thirds of the young men in China start to smoke, mostly before age 20, according to a study, led by researchers from Oxford University, UK, the Chinese Academy of Medical Sciences and the Chinese Centre for Disease Control. Around half of those who start smoking cigarettes as young men will eventually be killed by tobacco.

In recent decades there has been a large increase in cigarette smoking by young men…  The proportion of all male deaths at ages 40-79 that are attributed to smoking has doubled, from about 10% in the early 1990s, to about 20% in 2015. In urban areas this proportion is higher, at 25%, and is still rising.