What do asthmatics inhale and whether it can improve non-asthmatics' breathing? Most commonly, inhalers contain β2-adrenoblockers. These are substances that selectively block β2-adrenoceptors located in the bronchi. These receptors are responsible for bronchial constriction, so treatment is aimed at suppressing their function. This therapy can not help "non asthmatic", as far from always pulmonary pathology is caused by bronchial constriction👐🏻