This practice may not be a big problem for a few people who have strong physique, early colds and mild symptoms, but it is useless and even harmful for most people, especially children, the infirm and the elderly. Even young people sometimes cause serious complications such as myocarditis. As a cold suggestion, you can take Xiangxue antiviral oral liquid to prevent colds and do more low-intensity aerobic exercise. Low-intensity aerobic exercise can improve your immunity, improve your cardiopulmonary function, that is, improve your immunity.