Asthma is a respiratory condition that causes severe breathing impairment. Asthma may either be restrictive or inflammative,Asthma but these conditions can occur at the same time as well. In people with restrictive asthma, the tiny air passageways in the lungs begin to close, making the absorption of oxygen impossible. In inflammative asthma, the bronchioles in the lungs become irritated and inflamed. When this happens, they can grow to many times their normal dimensions. Asthma is especially dangerous when the restrictive and inflammative forms occur at the same time.

Because marijuana is a bronchodilator, it may help loosen up the air passageways in people with restrictive asthma. Allergies to marijuana are also extremely rare, which makes it a better option than many anti-asthma medications.