Exposure to second hand smoke (SHS) is a major health concern. This study sought to examine the smoking behaviors of casino workers in Macao, and explore how workplace smoking policies might affect that behavior. A majority of casino workers who smoked believed that exposure to SHS at work makes it harder to quit smoking, while over a quarter minded people smoking near them at work because of that reason. Over half of the workers believed that they would try to quit smoking if no-one was allowed to smoke in their workplace. The findings demonstrate how smoke-free casinos could lead to a healthier workforce, not just due to reduced exposure to dangerous chemicals in SHS, but also from the potential reduction in smoking among workers. The hospitality industry, and policy makers in government, should ensure that casinos, and their workforce, are not excluded from smoke-free legislation.