<s>[INST] I started smoking menthol cigarettes about 6 months ago from a regular light cigarette and am wondering if that is why I am having perisitant coughing that I did not have prior?  We are not sure if it's allergies,  but xray has shown my chest is fine, cultures are not coming up with anything so I am trying to delete things to figure out why this is happening. [/INST] Hi,Welcome to HCM,Your cough may be due to allergy/hyper reactivity to menthol cigarettes which at time cn cause bad cough. </s>