Abstract Background With the increased use of cannabis in the medicinal and recreational domains, it is becoming more important for physicians to better understand its harmful and beneficial effects. Although medical cannabis comes in several forms, the preferred route of administration is smoking or inhalation. After caring for three asthmatic patients who were treated with medical cannabis and who reported improvement in their symptoms, we decided to review the available data on the effects of medical cannabis on asthmatic patients.Objectives To review the known effects of medical cannabis on asthmatic patients.Methods A thorough search was conducted of the MEDLINE and PubMed databases as well...