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Meta-Analysis: Cannabis Use Not Linked To Elevated Risk of Oral Cancer
Zarqa, Jordan: Cannabis use is associated with a reduced risk of oral cancer, according to the results of a systematic review and meta-analysis published in the Journal of Ethnicity in Substance Abuse.
An international team of investigators from Jordan, Iraq, and Uzbekistan reviewed data from six case-control studies involving over 15,000 subjects.
Researchers identified no dose-response relationship between cannabis use and a heightened risk of oral cancers, regardless of subjects’ duration of use. Instead, investigators suggested that cannabis may provide “significant protective effects” against cancer. They caution, however, that their findings may be influenced by confounders, particularly researchers’ failure to identify subjects’ HPV (human papillomavirus) status. (HPV infection is linked to elevated cancer risk.)
“The pooled odds ratio demonstrated a statistically significant inverse association between marijuana use and oral cancer risk (OR = 0.66),” the study’s authors concluded. “However, given methodological limitations, heterogeneity in exposure assessment, and conflicting recent evidence, these findings require cautious interpretation. Future large-scale prospective cohort studies with standardized exposure measurements are essential for definitive conclusions.”
While cannabinoids have demonstrated well-established anti-cancer activities in preclinical models, their efficacy as an anti-cancer agent has rarely been assessed in clinical trials.
Full text of the study, “The association between marijuana use and oral cancer risk: A systematic review and meta-analysis of case-control studies,” appears in the Journal of Ethnicity in Substance Abuse.
Study: Low Levels of THC in Blood Not Associated With Significant Changes in Simulated Driving Performance
San Diego, CA: Subjects who have not recently consumed cannabis but still have residual levels of THC in their blood perform no differently on a driving simulator than do those who are THC-negative, according to data published in the journal Clinical Chemistry.
Researchers affiliated with the University of California at San Diego assessed THC blood levels and simulated driving performance in a cohort of 190 regular cannabis consumers. Study subjects were required to have abstained from cannabis for 48 hours prior to participating in the study.
Post-abstinence, nearly half of the study participants had detectable levels of THC (above 0.5ng/ml) at baseline, with one-quarter of participants testing positive for more than 2ng/ml of THC in blood. However, those testing positive for THC showed no significant differences in their baseline driving scores as compared to those with no quantifiable THC concentrations.
“Our data argue that the concentrations we measured at baseline likely reflect steady state THC concentrations in this population, several days after last use,” the study’s authors concluded. “We also show, using quantitative data from the driving simulator, that participants who exceeded the zero-tolerance and per se cutpoints (2 and 5 ng/mL) performed in a similar manner as those below these arbitrary values. These results add to a growing body of evidence that per se THC blood statutes lack scientific credibility as prima facie evidence of impairment.”
The findings are consistent with those of other studies reporting no correlation between the detection of either THC or its metabolites in blood, urine, saliva, and breath and impaired driving performance. Nevertheless, several states have enacted laws criminalizing drivers who operate a motor vehicle with trace levels of THC or THC metabolites, regardless of whether the driver is impaired.
In an accompanying editorial, authors said that the study’s conclusions “raise serious doubts about the scientific validity of using measures of delta-9-tetrahydrocannabinol in blood to identify cannabis-impaired drivers.”
NORML has consistently argued that law enforcement should not presume that the detection of either THC or its metabolites in bodily fluids is evidence of impairment because their presence is not predictive of diminished performance. Alternatively, NORML has called for the expanded use of performance-based tests, like DRUID or Predictive Safety’s AlertMeter, which compare subjects’ cognitive skills to either their own prior performance or an aggregate baseline.
Full text of the study, “Per se driving under the influence of cannabis statutes and blood delta-9-tetrahydrocannabinol concentrations following short-term cannabis abstinence,” appears in Clinical Chemistry. Additional information on cannabis and driving is available from the NORML Fact Sheet, ‘Marijuana and Psychomotor Performance.’
Analysis: Cannabis Terpenes Act as Agonists on Endogenous Cannabinoid Receptors
Ra’anana, Israel: Terpenes in the cannabis plant activate endogenous cannabinoid receptors in a dose-dependent manner, according to the preclinical data published in the journal Biochemical Pharmacology.
Israeli researchers assessed the modulatory ability of sixteen cannabis terpenes: α-pinene, β-pinene, limonene, myrcene, ocimene, sabinene, terpinolene, borneol, eucalyptol, geraniol, linalool, terpineol, β-caryophyllene, humulene, bisabolol, and nerolidol. Researchers reported “significant dose-dependent responses at both CB1 and CB2 receptors, … reaching a maximal response of about 10-60 percent the activation elicited by THC.” The study is among the first to characterize terpene interactions with CB2 receptors.
Activating the CB2 receptors is believed to provide cardioprotective, neuroprotective, and anti-inflammatory effects, but it does not elicit mood-altering effects.
“This study provides evidence suggesting that multiple cannabis-derived terpenes, when tested in the absence of cannabinoids, act as partial agonists at CB1R and CB2R, with significant variability in apparent potency, efficacy, and receptor selectivity,” the study’s authors concluded. “Collectively, these findings suggest a pharmacological basis for incorporating specific terpenes into ECS-focused product design and warrant further research into their tissue-specific activity, and synergistic potential when used in combination with cannabinoids or other therapeutic agents. The broad availability and favorable safety profiles of many terpenes further support their potential as accessible, scalable, and customizable tools in the modulation of endocannabinoid signaling.”
Prior studies have established that low doses of cannabis terpenes can amplify THC’s activity upon CB1 receptors. A 2023 research paper published in the Journal of Cannabis Research reported that cannabis flower with elevated levels of the terpenes myrcene and terpinolene is associated with greater perceived symptom relief among patients.
Full text of the study, “Selective activation of cannabinoid receptors by cannabis terpenes,” appears in Biochemical Pharmacology.
Ohio: Legislative Conference Committee Advances Bill Repealing Key Provisions of Voter-Approved Marijuana Law
Columbus, OH: Members of a legislative conference committee approved and advanced a negotiated version of Senate Bill 56, which makes numerous changes to the state’s voter-approved adult-use marijuana legalization law.
The Republican-spearheaded bill amends existing law in several ways. It stipulates that consumers cannot legally possess cannabis products sourced from out of state, including products legally purchased at licensed dispensaries in neighboring jurisdictions. No other legalization state imposes such restrictions.
It also repeals provisions that currently protect adult-use consumers from facing either workplace or professional disciplinary action, as well as other forms of discrimination based solely upon their private marijuana use. It imposes new arbitrary limits on the percentages of THC permitted in adult-use and medical cannabis concentrates and it caps the total number of retail licenses permitted statewide.
Other provisions in the legislation create a pathway for those seeking to expunge past marijuana-related convictions, limit the sale of certain hemp-derived products solely to state-licensed dispensaries, clarify that adults can legally consume cannabis on their private property (rather than solely inside their own private residence), and redirect a portion of tax revenues from marijuana sales to individual municipalities that license cannabis retailers.
NORML has vociferously lobbied against many of the proposed changes to Ohio’s adult-use marijuana law, which was approved in 2023 by 57 percent of voters. NORML’s action alert opposing SB 56 has been shared with lawmakers over 22,000 times. It states: “This bill is a slap in the face to the millions of Ohioans who voted in favor of Issue 2. Once again, politicians are arrogantly trying to claim that the public didn’t know what they were voting for.”
Members of the House approved the revised bill late Wednesday, with all Democrats voting against it. The legislation now awaits a final vote by members of the Senate, who are expected to reconvene in December. Once approved by the Senate, it will head to the desk of Republican Gov. Mike DeWine, who is expected to sign the bill into law.
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