This question is for my exam tmz so please help thanks Cigarette smoke contains tar nicotine and carbon monoxide which of these joins with hemoglobin?

hi.. .it is the carbon monoxide that binds to the Hb (haemoglobin),to form carboxyhaemoglobin. the nicotine tar gets accumulated in the alveoli of the lungs eventually leading to a condition called smoker's lungs. patients will present with early morning cough, rusty sputum and other symptoms of respiratory disease