Smoking for people with colds has adverse effects because the smoke of the cigarette itself irritates the respiratory mucosa when smoked. In many people who continue to smoke after a cold, the local inflammatory response can worsen, and common cold symptoms such as coughing and phlegm may increase as a result. Patients with colds often have viral infections, sometimes combined with other pathogens, and local respiratory tract lesions, especially upper respiratory tract lesions, where there is an inflammatory reaction in the airway mucosa itself. If you continue to smoke at this time, the smoke will continue to damage the airway mucosa, which is already inflamed locally, causing damage to the mucosa.