A cough lasting around 2 weeks that mainly appears when you are exposed to smoke or firewood fumes is most likely due to airway irritation or a post-infective sensitive airway. After a viral infection or repeated exposure to smoke, the bronchial tubes can stay extra sensitive for a few weeks, so even small triggers like fumes, dust, or strong smells can bring on coughing. Since you feel otherwise well, this pattern is less suggestive of a serious chest infection and more of an irritant or allergy-type response. The weakness and discomfort after taking Levomac 500 may be a side effect of the antibiotic or could also be unrelated and coincidental fatigue, especially if it was not clearly needed. Antibiotics are not always required for a cough unless there is a confirmed bacterial infection, and unnecessary use can sometimes cause side effects like weakness, stomach upset, or body discomfort. Right now, the best approach is to avoid smoke and firewood exposure as much as possible, stay hydrated, and use steam inhalation to soothe the airways. If the cough persists beyond another week, worsens, or you develop fever, breathlessness, or chest tightness, a proper medical evaluation is needed to decide whether any specific treatment is required.