Tobacco Smoke
This trigger can be avoided by simply avoiding areas where smoking is common or expected. If a family member smokes, he or she should be informed that tobacco smoke is a common asthma trigger, and smoking should not take place around you. Keep in mind that smoke particles can linger in the air long after smoking is finished, so make sure that a room where smoking has taken place is well ventilated before you enter. Also consider that substances from tobacco smoke can remain on a smoker’s clothing, so the presence on a habitual smoker might be enough to trigger an attack. If you must enter an area where tobacco smoke is present, be sure to have your medications ready and to let other people know how to assist you.
Secondhand smoke irritates the already inflamed lungs of asthma suffers, so it should be avoided even if it is not a trigger for your asthma. Secondhand smoke is also believed to be a major cause of asthma in children. Due to their smaller size and more rapid breathing than adults, children are more susceptible to its dangers. Care should always be taken to avoid exposing children to secondhand smoke.