How to prevent asthma ?

Stop smoking ...: The single most important modifiable risk factor is to stop smoking. SIGN/BTS 2014 recommends (Level B brit-thoracic.org) "Parents and parents-to-be are advised of the many adverse effects which smoking has on their children including increased wheezing in infancy and increased risk of persistent asthma" Weight loss if obese and breathing exercises may have a preventive role, or adjuvant to drugs

Asthma: Asthma is a common condition that affects the airways. The typical symptoms are wheeze, cough, chest tightness, and shortness of breath. Symptoms can range from mild to severe. Treatment usually works well to ease and prevent symptoms. Treatment is usually with inhalers. http://patient.info/health/asthma-leaflet

See your family doc: You should avoid things that cause your asthma if you know what they are (for instance dust or cats). There are medications that are breathed in that can help prevent an asthma attack, these need to be prescribed by a doctor.