June 10, 2020 10:17 am ETEstimated Read Time: 3 Minutes
Cannabis is the most commonly usedillicit drug in the world. However, because of a changing legal landscape combined with a rising interest in medicinal and therapeutic use, there is an increasing trend in long‐term use and possibly cannabis impairment.
It has been 23 years since California first legalized cannabis. Fears were monstrous and far-fetched. Much of the general population at that time was still convinced that a society of “potheads” wouldruin the country. On the contrary, nothing really happened and life continued on.
While there was some data coming out of early legalization days that suggested increased risk to youth and even increased accidents related to using cannabis, now data actually shows the opposite. Overall,youth cannabis use is going down in legal states as well as a drop in the violent crime rate, opiate overdoses, and increased economic markets.
When it comes to the growing body of the population becoming avid, regular cannabis users, science has evidence showing frequent, long-term users develop a sometimes significant tolerance.
Those Who Consume Regularly Get Less Intoxicated At Consistent Doses
A growing body of evidence suggests that regular cannabis users develop tolerance to the impairing as well as the rewarding effects of THC. A new addition to this body is a recent 2019 study that found cannabis altered circuitry and distorted behavior in occasional, but not chronic, users. This suggests reduced responsiveness of the reward circuitry tocannabis intoxication in chronic users due to their repeated exposure to THC-containing cannabis.
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The researchers summarized that “Taken together, the results suggest a pharmacodynamic mechanism for the development of tolerance to cannabis impairment, which is important to understand in the context of the long‐term therapeutic use of cannabis‐based medications, as well as in the context of public health and safety of cannabis use when performing day‐to‐day operations.”
Data Demonstrates Cannabis Tolerance
In the double‐blind, randomized, placebo-controlled, cross-overstudy, 12 occasional and 12 frequent cannabis users consumed the drug or a placebo before undergoing brain imaging scans. The participants also completed a measure of their reaction times and attentional lapses, along with an assessment of their subjective high. This study is also noteworthy because it is the first time that researchers have tried to visualize how cannabis tolerance develops in real-time.
In occasional users, they found that cannabis altered reward system circuitry in the brain, which was associated with behavioral measures (increased feelings of high and decreased sustained attention). Such changes were absent in chronic cannabis users, who did not show any brain changes or any cognitive impairment.
Tolerance Is a Sensitivity Spectrum
Cannabis tolerance is not a final, permanent state that is achieved after chronic cannabis use but rather a temporary state of decreased sensitivity to cannabis exposure that dynamically fluctuates across the spectrum of a full-to-no experience of cannabis effects, depending on the pattern of cannabis use. The study found that not only did occasional users experience measurable markers associated with increases in subjective high but also noted significant decreases in performance on a sustained attention task. Such changes were absent in chronic, long-term users.
The finding that cannabis altered reward circuitry and distorted behavior in occasional, but not chronic, users suggests the development of neural adaptations in the brain’s reward system after excessive use of cannabis that reduces the circuitry and behavioral response to acute cannabis impairment. In layman’s terms, chronic users just don’t get as high as occasional users, meaning they are not nearly as impaired as occasional or infrequent users with the same amount of consumption.
Natasha has worked as a journalist in the cannabis scene for several years. She travels regularly in her tiny house school bus conversion to keep up to date with the ever-changing industry. Her experience is varied and eclectic.
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