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Cannabis for Asthma

Asthma and Medical Cannabis


Asthma is a long-term inflammatory disease, and the symptoms include shortness of breath, wheezing, coughing, chest tightness, bronchospasm and air flow restriction. Attacks are more likely to happen at night, and may become worse after exercise. Some people suffer from exercise-induced asthma aka exercise-induced bronchoconstriction.

Potential Efficacy / Quality of Evidence (Low, Average, High) of Medical Marijuana for Asthma


Cannabinoids, Terpenes/Terpenoids, Strains and Ratios that May Help

THC, ocimene, and pinene. CBD may help as an antispasmodic, preventing the muscles in the lungs from contracting during an asthma attack.

Medical Cannabis Pros

Medical Cannabis Cons

  • Whilst terpenes like delta-3-carene can be effective anti-inflammatories, they can also sometimes lead to decreases in respiratory frequency. Burning terpenes releases hydrocarbons, which can cause inflammation in the respiratory system.
  • Smoking cannabis is not ideal for asthma patients.
  • The terpenes found in cannabis may cause an allergic reaction in some.
  • Vaporizers can vary in quality
  • Inhalers may be the ideal ingestion method, as other methods like tinctures and edibles may not be best for sudden asthma attacks. However, inhaler safety still needs to be tested for – cannabinoids work differently from corticosteroids.

More About the Condition

Asthma is a long-term inflammatory disease that can cause shortness of breath, wheezing, coughing, chest tightness, bronchospasm and air flow restriction. Asthma attacks are more likely to happen at night, and may become worse after exercise. Some people may get several attacks a day or week. Allergies, environmental factors (e.g. living in an area with high amounts of dust and pollutants), and genetic factors are thought to cause asthma. Asthma can also be related to allergies/hayfever or chronic pulmonary obstructive disease. Asthma could be an autoimmune condition.

Over 3,500 people die from asthma attacks, or asthma-related causes in the US every year. There are approximately 19.2 million adults and 5.5 million children in the US who have asthma. Asthma is the primary diagnosis for 1.6 million emergency department visits. Asthma sufferers are more likely to contract pneumonia, or suffer other complications arising from cold or flu.

Asthma is usually treated by the use of reliever inhalers (for immediate relief) and preventer inhalers (to prevent asthma attacks from occuring in the first instance). These inhalers contain short- and long- lasting beta 2 agonists like albuterol (ProAir HFA, Ventolin HFA, others) and levalbuterol (Xopenex) and/or steroids like fluticasone (Flovent) or budesonide (Pulmicort). Leukotriene modifiers like montelukast (Singulair), zafirlukast (Accolate) and zileuton (Zyflo) help relieve asthma symptoms for up to 24 hours. Theophylline (Theo-24, Elixophyllin, others) is a daily pill that helps keep the airways open (bronchodilator) by relaxing the muscles around the airways, but is rarely used nowadays. Allergy injections like Omaliizumab (Xolair) may also be used.

Quotes from the Experts

“Cannabis has a bronchodilator effect on the airways and might have an anti-inflammatory effect on asthmatic patients. However, harmful effects on the lungs are mainly attributed to smoking and include airway irritation and the development of chronic bronchitis symptoms.” ‘Medical Cannabis in Asthmatic Patients‘ Jarjou’i A, Izbicki G. Isr Med Assoc J. 2020 Apr;22(4):232-235.

“CBD seems to be a potential new drug to modulate inflammatory response in asthma.” Evaluation of Serum Cytokines Levels and the Role of Cannabidiol Treatment in Animal Model of Asthma‘, Francieli Vuolo, Fabricia Petronilho, Beatriz Sonai, Cristiane Ritter, Jaime E. C. Hallak, Antonio Waldo Zuardi, José A. Crippa, Felipe Dal-Pizzol

Mediators Inflamm. 2015; 2015: 538670. Published online 2015 May 25. doi: 10.1155/2015/538670

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