August 30, 2019 The Wyoming Department of Health (WDH) is helping residents learn about secondhand smoke dangers to encourage them to protect themselves and their families by avoiding exposure. “The Surgeon General and other medical experts have been telling us for years there is no risk-free level of secondhand smoke exposure,” said Joe D’Eufemia, Tobacco Prevention Program manager with WDH. “We know now even brief exposure can be harmful to health.” D’Eufemia said there are more than 7,000 chemicals in tobacco smoke and at least 250 are known to be harmful, including hydrogen cyanide, carbon monoxide and ammonia. “Among the harmful chemicals in tobacco smoke, at least 69 can cause cancer,” he said. “Since 1964, an estimated 2,500,000