It has been shown that the children of smokers are more likely to develop asthma than their peers. Avoiding tobacco smoke can be difficult and embarrassing at times, but it's worth it to avoid the irritation that smoke causes. Even smoke trapped in a smoker's clothing may trigger an attack. Stay away from them until they dry or wear a respirator mask. Ask coworkers to give them up.
Some gyms specifically ask users to leave perfumed sprays and deodorants at home.
Don't use your home fireplace or wood-burning stove. Some gas stoves leak cooking gas, which can be a trigger. Get your stove checked. Buy non-scented varieties. A written treatment plan from your doctor takes the guesswork out of managing asthma.