More THC, barely any additional effects: A new study challenges common assumptions about the potency of cannabis

Doubling the THC dose produces surprisingly mild effects

Researchers, including scientists from the King's College London, examined the acute effects of THC through a systematic review and a meta-analysis. The analysis focused on 40 randomized, double-blind, placebo-controlled studies involving 983 participants who have limited experience with cannabis.

The researchers compared the sensations of intoxication, anxiety, fatigue, alertness, and other subjective effects reported after THC administration with those observed with a placebo.

Using a standard THC unit of 5 mg Based on the proposed study, they found that inhaled THC increased subjective intoxication by 34.3 points on a 100-point scale compared to the placebo. Increasing the dose to 10 mg of THC brought the estimated score to about 39 points, according to the researchers' explanation.

This represents an increase of only 15 % despite the dose being doubled.

This trend illustrates diminishing returns in the dose-response relationship: an additional intake of THC may intensify intoxication, but each increase does not necessarily result in a proportional change in the perceived effects.

Smoking, vaping, and consuming edibles: Does THC dosing work differently?

The study also examined the various Methods of THC Administration. Of the 40 studies reviewed, 22 focused on inhaled THC, administered via smoking or vaporization, while 18 focused on oral administration.

For the inhaled cannabis, higher doses of THC were significantly associated with stronger feelings of intoxication.

The researchers did not find no statistically significant linear relationship between the oral dose of THC and subjective effects, including intoxication, anxiety, fatigue, or alertness.

However, that does not mean that increasing the dose of edible cannabis products (gummies, space cakes(…) has no effect. The available studies have simply not demonstrated a consistent linear relationship.

Differences in experimental protocols and the more limited database of individual results make it difficult to compare different patterns of consumption.

A higher dose of THC does not necessarily lead to more anxiety

The study also examined effects beyond intoxication. Compared to the placebo, inhaling 5 mg of THC resulted in an increase in the’anxiety score of 14.4 points and fatigue by 26.3 points. Alertness decreased by 40.2 points, while the sense of satisfaction fell by 71 points.

Once again, higher doses of inhaled THC were not significantly associated with increased anxiety or fatigue, nor with changes in alertness. Higher doses were associated with greater satisfaction but with a decrease in calmness, illustrating the complexity of psychological effects of THC.

The researchers also observed that participants' reported levels of intoxication and satisfaction became more consistent as the inhaled doses increased.

These results should not be interpreted as evidence that the stronger cannabis is harmless. Individual reactions may vary, particularly among inexperienced users.

Cannabis Tolerance and the Limits of Stronger Products

These findings also have implications for the cannabis tolerance. THC primarily affects the CB1 receptors within the endocannabinoid system, which helps regulate mood, appetite, sleep, and stress.

Repeated exposure can reduce receptor availability. Regular users may need larger amounts to achieve the effects they were previously accustomed to.

Frequent consumption of high-potency cannabis has also been linked, in other studies, to increased risks of addiction and mental health disorders among vulnerable individuals.

The authors acknowledge that there are significant limitations. The majority of participants were men, and the studies differed in terms of THC composition, doses, and experimental conditions. Further controlled research is needed to clarify these relationships.

Nevertheless, the main conclusion calls into question the assumption that stronger cannabis automatically produces a proportionally stronger high. For less experienced users, the results reinforce the risk reduction advice A well-established rule: «Start slowly, and take it step by step.».