As marijuana legalisation spreads across more states, public health officials are raising concerns about the health effects of secondhand marijuana smoke. This article explores recent studies that examine the risks associated with exposure to marijuana smoke, especially in public and indoor settings.

Secondhand Marijuana Smoke: A Growing Concern

Context of Studies

Recent studies have drawn on methodologies previously used to assess the impact of secondhand tobacco smoke. However, LaTrice Montgomery, an adjunct associate professor of psychiatry at the University of Cincinnati College of Medicine, points out that marijuana is not tobacco, and its impacts on heart and lung health are still not fully understood.

Outdoor Exposure Study

Researchers from the National Institutes of Health conducted a study involving security personnel at an outdoor venue, including off-duty police officers, who were exposed to secondhand cannabis smoke for several hours.

• Blood and Urine THC Levels: The study measured THC levels—the psychoactive component in cannabis—in participants’ blood and urine before and after the event.
• Findings: Detectable levels of THC were found in participants’ blood, even in an outdoor setting with circulating air. Although these levels were not high enough to cause a failed drug test, they were present nonetheless.

Immediate Symptoms and Health Effects

Participants in the outdoor exposure study reported several immediate symptoms:

• Itchy and Burning Eyes: Many reported experiencing itchy, burning red eyes.
• Headaches and Anxiety: Higher levels of anxiety and headaches were also noted, symptoms commonly associated with direct cannabis use.

Implications for Youth and Teenagers

One significant concern is the impact of marijuana smoke at events where many young people are present. A separate study has shown troubling correlations regarding cannabis use among teens:

• Increased Odds for Psychotic Episodes: Teens who use cannabis face 11 times higher odds of experiencing a psychotic episode compared to those who do not use the drug.
• Uncertain Long-Term Effects: Karly Danos, a residential therapist at Lindner Center of Hope, highlighted that the study showed an association but not a direct cause and effect. The long-term impact of both direct and secondhand marijuana exposure on the teen brain remains uncertain.

Indoor Exposure Risks

Researchers also emphasised the dangers of smoking marijuana indoors, where residue can settle on surfaces:

• Film or Residue: When marijuana is smoked inside a home or other indoor environments, a film or residue can form on surfaces.
• Risks to Young Children: If young children come into contact with this residue, it could pose significant health risks.

These recent studies underscore the need for further research and public awareness regarding the health impacts of secondhand marijuana smoke. As legalisation continues to expand, understanding these risks will be crucial for protecting public health, particularly among vulnerable populations such as teens and young children.

Source: Local12