Quitting smoking does not cause asthma. 1. Quitting smoking is a kind of protective behavior for the respiratory tract, not smoking can reduce the stimulation of the respiratory tract, reduce the probability of the onset of asthma, so quitting smoking will not cause asthma, and asthma is not associated with quitting smoking. 2. After quitting smoking, you should also stay away from second-hand smoke, if you live in the environment of second-hand smoke for a long time, the respiratory system is stimulated, may also directly trigger asthma. Therefore, even if you have quit smoking, you should make some improvements in the environment and stay away from secondhand smoke as soon as possible. 3. After quitting smoking, it is recommended to exercise regularly and breathe fresh air, which can effectively prevent asthma and reduce the probability of its onset. If you have difficulty breathing, shortness of breath and other symptoms, you need to consult a doctor in a timely manner, and through the diagnosis of a professional physician, analyze the cause of the disease and then treat it to prevent the disease will continue to progress.