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Smoking cannabis (or marijuana) damages the human lung and regular use leads to chronic bronchitis. It can also cause an immune-compromised person to be more susceptible to lung infections. No one should be exposed to second-hand cannabis smoke. Due to the risks (and potentially unknown risks) it poses to lung health, The Lung Association – Ontario cautions the public against smoking cannabis, as well as tobacco products. More research is needed to fully know and understand the effects of cannabis on lung health.

Overview of cannabis (also known as marijuana)

WHAT IS CANNABIS (OR MARIJUANA)? The term cannabis refers to the many ways in which the Cannabis Sativa plant is prepared for consumption.

Smoking cannabis

SMOKE IS HARMFUL TO LUNG HEALTH. Whether it’s from tobacco or cannabis, toxins and carcinogens are released from the burning of those substances.

Cannabis edibles

CANNABIS EDIBLES. Cannabis edibles are food products that are made with either cannabis or cannabis oils.

Mixing cannabis

MIXING CANNABIS AND TOBACCO SHOULD BE AVOIDED. This increases your risk of harmful respiratory symptoms.

Vaping cannabis


Medical cannabis (or marijuana)

MEDICAL CANNABIS. The Lung Association – Ontario encourages continued research into the use of cannabis for medical purposes.

Cannabis harm reduction and prevention

HARM REDUCTION AND PREVENTION. While there is more research needed in this area, smoking of any substance has an impact on the respiratory system and should be avoided.

Protecting children from cannabis

CHILDREN ARE AT A GREATER HEALTH RISK FOR CANNABIS USE. Early and frequent cannabis use is associated with poorer health outcomes.