Those most at risk include people with severe asthma, and older people with heart or chronic respiratory problems. It is very helpful to know what triggers your asthma symptoms and, wherever possible, try to avoid them. For example, if cold air is a problem then you might consider staying indoors when the weather gets very cold. If you do go out, wear a scarf over your nose and mouth. This helps to warm up the air before you breathe it in.
Smoking is bad for everyone, but particularly for people with asthma.
If you have asthma and smoke, you are increasing the risk of an asthma attack and may be permanently damaging your airways. Remember - it is never too late to stop. Other people's cigarette smoke can worsen your asthma. If you live with a smoker, try to persuade them to give up - or at the very least to smoke in a different room. Smoking outside is an even better option.