You need to see an ENT doctor for your rhinitis or an chest physician for your asthma, bronchitis. They will guide you regarding the possible allergen. However even after identifying the allergen, you may not be able to avoid it completely and hence you may have to use nasal sprays/ inhalers/medicines that will help you reduce the symptoms. Smoking and Drinking reduce the body's immunity and hence I would advise you to stop it. Stop eating Junk food and prefer home made food with lots of salad, fruits , nuts in the diet.