Hello ! you seems to have allergic response to cigarette smoke .It can cause Allergic rhinitis and Bronchial Asthma. , that will result in your nose getting stuffy and your airways to constrict making it difficult for air that you breathe in and out to pass along your airways. Since how long have you been smoking ? What form of smoking ? How many per day ? Do you wheeze ? For symptomatic benefit for your current episode, u will need to do steam inhalation, take decongestant/ antihistamine medication , antibiotic if you have puruent phlegm on coughing. Do warm saline gargle. Get yourself checked by a physician in person . If there is evidence of constricted airways then you will need bronchodilator n steroid drugs. Get a Chest X ray and Spirometry done for evaluation. Do quit smoking.