Scientists Reveal the Largest Study on Cannabis Strength

Over the past 50 years, cannabis strength has changed dramatically, making today’s weed strength far more potent than ever before. A groundbreaking study led by researchers from the University of Bath’s Addiction and Mental Health Group has analyzed over 80,000 cannabis samples to understand how its potency has evolved.

The findings? Cannabis has become significantly stronger, with THC levels steadily rising while CBD levels remain unchanged. This shift raises concerns about the potential impact on addiction and mental health.

The Largest Study on Cannabis Strength Ever Conducted

The study systematically reviewed data from cannabis samples collected between 1970 and 2017 across multiple countries, including the UK, USA, Netherlands, France, Denmark, Italy, and New Zealand. By analyzing both herbal cannabis (flower) and cannabis resin (hashish), the researchers uncovered striking trends:

Key Findings from the Study:

• Herbal cannabis THC levels increased by 14% (1970-2017).
• Cannabis resin THC levels surged by 24% (1975-2017).
• CBD levels remained stable in both herbal cannabis and cannabis resin.
• Higher THC concentrations correlate with an increased risk of addiction, psychotic disorders, and cannabis-related health issues.

Dr Tom Freeman, lead researcher and director of the Addiction and Mental Health Group, noted:

“As the strength of cannabis has increased, so too has the number of people entering treatment for cannabis use problems. More Europeans are now entering drug treatment because of cannabis than heroin or cocaine.”

Why Is Weed Getting Stronger?

The increase in weed strength is largely due to market preferences. Over the past few decades, cannabis consumers have moved away from low-THC traditional cannabis and toward high-THC strains like sinsemilla. This shift has led to an overall increase in the potency of cannabis available on the market.

The Rise of Sinsemilla

Sinsemilla (Spanish for “without seeds”) is a high-potency cannabis variety that contains significantly more THC than traditional herbal cannabis. In the past, many cannabis products were lower in THC and contained a more balanced ratio of CBD oil. However, with the push for higher THC levels, the natural presence of CBD oil in many strains has diminished.

What Does This Mean for Consumers?

The rising cannabis strength presents both opportunities and risks. While some users may prefer stronger cannabis for intensified effects, increased weed strength comes with significant downsides:

Risks of Strong Weed:

• Increased risk of addiction: Higher THC levels are linked to a greater likelihood of cannabis use disorder.
• Mental health concerns: Stronger cannabis is associated with a higher risk of psychosis, anxiety, and cognitive impairment.
• Lower CBD content: With CBD oil playing a potential role in moderating THC’s effects, lower CBD levels could increase negative side effects.

Possible Solutions & Harm Reduction Strategies

As cannabis potency rises, harm reduction strategies similar to alcohol guidelines could help consumers make informed decisions. The study suggests implementing:

• Standardized THC units, similar to alcohol units, to help users monitor intake.
• Clear labelling on cannabis products to indicate THC and CBD concentrations.
• Increased education on cannabis potency and potential risks.

The Role of CBD Oil and CBD Flower in Balancing THC

As THC levels continue to rise while CBD levels remain unchanged, finding ways to balance these cannabinoids becomes increasingly important. CBD oil and especially CBD flower can help moderate the effects of high-THC cannabis, offering a more sustainable way to consume potent strains. CBD is known for its potential to counteract some of THC’s psychoactive effects, reducing anxiety and lessening impairment.

What About Legal Cannabis?

With cannabis legalization expanding in countries like Canada, Uruguay, and parts of the USA, policymakers face the challenge of regulating strong weed to minimize health risks. In New Zealand, a 2020 referendum on cannabis legalization proposed limiting THC levels—but the measure ultimately failed.

The Role of CBD Oil in Harm Reduction

Unlike THC, CBD oil is non-intoxicating and has shown promise in reducing THC-induced anxiety and psychotic symptoms. Some experts argue that cannabis products should contain a more balanced THC-to-CBD ratio to mitigate risks. Unfortunately, this study shows that CBD levels have remained stable, while THC has skyrocketed.

Final Thoughts

This landmark study provides crucial insights into the evolution of cannabis strength over time. As weed strength continues to increase, consumers, healthcare professionals, and policymakers need to stay informed about its implications.