Many things can trigger symptoms in people with breathing conditions such as asthma or COPD. They may be allergens such as mold, pollens, or dust. Or they may be irritants such as smoke, the aerosol mist from vaping, tobacco, other nicotine products, or strong odors. You may find things that trigger symptoms but aren't allergens or irritants. These include weather changes, illness, stress, and exercise. The tips below can help to ease your symptoms.