In recent years, smog often covers large areas of China. During haze days, weather forecasts repeatedly remind people to strengthen precautions and avoid outdoor activities as much as possible. Even outdoor activities must take necessary protective measures. However, there are always many "brave" People, they don't take this kind of reminders at all and engage in various outdoor activities in severe haze weather without wearing a mask at all. Which of the above is not likely to be the reason why these "braves" do not wear masks in the hazy days? ['Now some domestic and foreign propaganda about the haze hazard is always a bit exaggerated, can not be taken too seriously.', 'You are in good health and can carry it, not to mention that many people around do not wear masks.', 'The haze will not cause sudden death of people, but the harm to people is long-term and serious.', 'Wearing a mask has no practical effect on haze prevention, and it is neither convenient nor comfortable.']