Online talk show calls for stopping second-hand smoke stockbot 0 378 2021.05.17 14:41 http://vietnamnews.vn/society/949685/online-talk-show-calls-for-stoppi… + 4 https://vietnamnews.vn/rss/society.rss + 0 Smoking is the leading cause of lung cancer in Việt Nam. Tobacco smoke contains more than 7,000 chemicals, of which 69 cause cancer, participants heard at an online talk show on Friday to respond to World No Tobacco Day on May 31.