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Study: “Cannabis Smoking Does Not Appear to Be Carcinogenic”


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Cannabis Smoke

Cannabis smoke exposure, even long-term, is not positively associated with chronic obstructive pulmonary disease (COPD), lung cancer, or irreversible airway damage, according to a literature review published in the journal Breathe.

British researchers reviewed nearly 20 observational studies assessing cannabis inhalation and lung health, involving over 25,000 subjects, reports NORML. They reported that the available literature fails to support an association between cannabis smoke exposure and the onset of COPD, emphysema, lung cancer, shortness of breath, or irreversible airway damage.

“The long-term respiratory effects of cannabis differ from traditional smoking,” authors concluded. “We do not know why cannabis smoking does not appear to be carcinogenic. Various factors might contribute, e.g. potential anti-inflammatory and anti-neoplastic properties of THC and other cannabinoids.”

Researchers did identify a link between marijuana inhalation and more frequent cough, sputum production, wheezing, and chronic bronchitis – though they acknowledged that these symptoms largely cease upon quitting. Authors also acknowledged that vaporizing cannabis – a process which activates cannabinoids, but does not heat them to the point of combustion – reduces many of these symptoms.

The study’s findings are similar to those of others reporting that cannabis smoke and tobacco smoke differ significantly in their health effects, and that long-term cannabis smoke exposure is not associated with poor lung health.


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Arizona legalized marijuana for recreational use in November 2020. The law allows adults aged 21+ to purchase, possess and use cannabis. State-licensed cannabis dispensaries began selling recreational marijuana in early 2021. There are over 150 dispensaries in Arizona — a majority of them are in populous areas such as Phoenix, Tucson and Flagstaff. Recreational cannabis delivery services began operating in 2024.  


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