Cannabinoid receptors have been found in human lung tissue, although in relatively low concentrations, and are thought to play a vital role in the regulation of inflammation, muscular contractions and dilations, and various metabolic processes. However, research into the immune-modulated inflammatory response (and how cannabis may assist it) is in its infancy.


The ability of cannabis to act as a bronchodilator is perhaps its most significant property in terms of the treatment of asthma. During an asthma attack, the bronchioles (the branching network of tubes that carry oxygen to the alveoli) become constricted, causing the rate of oxygen flow to drastically reduce.