Fighting drug abuse has been a priority for the Chinese government in recent years. The percentage of drug users in China remains well-below the world average. For more on this issue, CGTN reporter Zou Yun talked to Andy Tsang Wai-hung, former police chief of the Hong Kong Special Administrative Region. He's now the deputy director of China's National Narcotics Control Commission. He shares his thoughts on key issues concerning China and world's anti-drug efforts.