Researchers Review Two Decades of Data and Warn of Risks from Continuous Marijuana Use

A recent study conducted by the University of Southern California (USC) in the United States has raised new concerns about frequent marijuana use, especially when smoked. After analyzing health data over a 20-year period, researchers suggested that regular and intense consumption of the substance may significantly increase the risk of head and neck cancer. The study, published in a major scientific journal, showed that frequent marijuana users had 3.5 to 5 times higher chances of developing these types of cancer compared to those who do not use the substance.

Head and neck cancers encompass tumors affecting areas such as the oral and nasal cavities, pharynx, larynx, salivary glands, and thyroid. Traditionally, these cancers are strongly associated with smoking and excessive alcohol consumption, but the USC study highlighted that frequent marijuana use, particularly through inhalation, may have harmful effects comparable to tobacco.

Research Details

The team of scientists at USC analyzed medical records of 116,000 people, comparing individuals who used marijuana with non-users of similar health profiles. They observed a concerning correlation between constant use of the substance and the development of cancers. According to the study, the burning of cannabis occurs at higher temperatures than tobacco, which may exacerbate inflammatory damage to the respiratory system.

Despite the evidence suggesting a relationship between marijuana use and cancer risk, the authors of the research acknowledge significant limitations in their conclusions. They pointed out the lack of detailed information about the exact dosage, frequency, and method of marijuana use by participants as one of the main challenges in establishing a more solid and definitive link between the substance and tumor development.