Around a million people with asthma are relying on reliever inhalers to manage their condition, increasing risk of serious illness, a charity has warned.
Asthma and Lung UK said that an estimated one in five people with asthma in the UK are using their reliever inhaler instead of their preventer one.
Preventer inhalers should be used every day to keep down inflammation and swelling in the airways and prevent someone having an asthma attack, while a reliever inhaler, which is usually blue, should be used when someone has asthma symptoms like coughing and wheezing.