Don't smoke!! It takes time for the inflammation of smoking to resolve.
Make sure overall your asthma is under control as well. If it is not you are likely to have a worse reaction and one that is harder to control with medication.
And yes you need to stop smoking, it is the worse habit to have with asthma and will cause very bad consequences throughout the rest of your life - COPD, emphysema and lung cancer
You have to stop smoking. Period. You are risking the chance of death. You know. No more swimming. No more parties. No more boyfriend or girlfriend. Rotting in a grave. Not all asthmatics are that sensitive to smoke, but if you are you must cease smoking. Forever.