Almost 100 million adults in China have COPD in all age groups in China shows that most people are unaware that they have chronic lung disease. ScienceDaily. Almost 100 million adults in China have COPD: The largest COPD study in all age groups in China shows that most people do not know that they have chronic lung disease. The study calls for the development of new national health strategies to prevent COPD, including smoking cessation programmes, stricter control of air pollution and use of biomass, and the identification of COPD in people at high risk to test lung function. According to researchers, the study, which included lung function tests for more than 50,990 participants, is the largest multistage COPD study ever conducted in China. This study, which included lung function tests for more than 50,990 participants, is the largest age-related COPD study ever conducted in China. Based on lung function tests, researchers estimate that by 2015 China will have 99.9 million people aged 20 years and over with COPD. Researchers suspect that people who have not smoked may have developed COPD due to other risk factors or environmental stress, such as air pollution, chronic childhood cough, parental history of respiratory illness, low body weight and low school performance. COPD, an inflammatory lung disease that blocks the air flow to the lungs, is the third leading cause of death in China. Researchers found that most people with COPD were not aware of their disease and only a few lung function tests before the study. Chronic obstructive pulmonary disease in China: National prevalence study only 2.6% of participants were aware of their disease, and only 12% of people with COPD reported they had a test of lung function before the study.