Cannabis does not cause “next-day impairment” researchers found in a new study published last week in the journal Psychopharmacology. Researchers found little evidence to suggest that THC can impact a person’s performance the next day, though any experienced smoker could tell you the same.

Researchers observed 20 adults with physician-diagnosed insomnia who consumed cannabis irregularly, gathering existing data from a larger study investigating the effects of THC and CBD on insomnia. Since the participants were taking THC and CBD right before bedtime, it was a perfect pool of subjects to examine next-day effects.

People received either a 2 ml dose of cannabis oil containing 10 mg THC and 200 mg CBD, or a placebo, being randomly selected. Within two hours of waking up, participants had to complete cognitive tasks and psychomotor tests.

The study shows that people who took 10 mg of THC, the intoxicating ingredient, showed little to no impairment the next day, suggesting that it’s entirely safe to drive after taking cannabis the night before. People who took THC before bedtime nearly aced the test the next day. Participants showed “no differences in ‘next day’ performance in 27 out of 28 tests of cognitive and psychomotor function and simulated driving tests relative to placebo.”

“The use of cannabis by night as a sleep aid is highly prevalent and there are legitimate concerns that this may lead to impaired daytime (‘next day’) function, particularly on safety sensitive tasks such as driving,” said the researchers at Macquarie University in Sydney, the University of Sydney, Royal Prince Alfred Hospital in Sydney, Gold Coast-based Griffith University and Johns Hopkins University. 

The study was written by Anastasia Suraev,  Danielle McCartney,  Nathaniel S. Marshall, Christopher Irwin,  Ryan Vandrey,  Ronald R. Grunstein,  Angela L. D’Rozario,  Christopher Gordon,  Delwyn Bartlett,  Camilla M. Hoyos and Iain S. McGregor. Many are associated with the University of Sydney’s Lambert Initiative for Cannabinoid Therapeutics, and have studied cannabis impairment in the past. 

“The results of this study indicate that a single oral dose of 10 mg THC (in combination with 200 mg CBD) does not notably impair ‘next day’ cognitive function or driving performance relative to placebo in adults with insomnia disorder who infrequently use cannabis,” the study reads. “Larger studies in patient populations are required to determine the effects of repeated dosing with THC (with or without CBD), and at higher doses of THC, on ‘next day’ function.

Researchers associated with the Lambert Initiative have found data showing that impairment from THC lasts only hours, while drug test can detect THC for weeks if not months after consuming it, long after the effects have worn off.

While researchers noticed minor but insignificant changes in cognitive function, further tests showed that there was likely no significant impairment.

“Importantly, no significant difference in accuracy was observed on the more difficult ‘hard/incongruent condition’ of the Stroop-Word Test, which requires participants to match the meaning of the word presented, not the printed colour of the word,” authors added. “For comparison, the morning after alcohol consumption (i.e., the hangover state) produced significantly greater interference on the Stroop-Word Test, but not the Stroop-Colour Test, relative to the alcohol-free control group (i.e., no hangover state).”

Impairment and Drug Tests

Recent studies have shown that levels of THC detected in the blood or breath of cannabis consumers is not a reliable indicator of impairment. Researchers also found that levels of THC in blood and breath did not provide reliable evidence of how recently a test subject had consumed cannabis.

Neither the detection of THC in blood nor in breath is correlated with impairment of performance or recency of cannabis exposure, according to data published in the journal Nature Scientific Reports.

Researchers wrote that “finding an objective measure of recent cannabis use that correlates with impairment has proven to be an elusive goal.” Some states have enacted laws that set per se legal limits on the amount of THC a driver may have in their blood, similar to the 0.08% blood alcohol concentration limit in effect nationwide.

“These findings provide further evidence that single measurements of specific delta-9-THC blood concentrations do not correlate with impairment, and that the use of per se legal limits for delta-9-THC is not scientifically justifiable at the present time,” wrote the authors of the study.

To conduct the study, the researchers recruited a group of test subjects, most of whom were daily cannabis users. The scientists then determined the THC levels in their blood and breath prior to and after inhaling cannabis.

While any cannabis consumer with experience knows that the effects last only a matter of hours, science to show that impairment doesn’t last that long now backs it up.

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We’re abundantly familiar with the stereotypes surrounding cannabis use that still prevail in today’s world, namely tropes embraced over the years in the media and among anti-reform advocates deeming that regular cannabis use makes people lazy and unproductive.

As cannabis use is becoming increasingly more common, many regular consumers will attest that this broad assumption is far from the truth, but a new study has provided further insight on how regular cannabis users tend to function after consuming. 

Ultimately, researchers found that getting high was associated with more positive emotions and fewer negative emotions in consumers, with minimal effects on motivation or objective effort willingness. They also found that frequent cannabis use had a lack of “hangover” effects.

The Changing Nature of the Cannabis Consumer

Researchers at the University of Toronto conducted the new study, published in the journal Social Psychological and Personality Science, in an effort to describe the effects of chronic cannabis use on emotions, motivation, effort and self-regulation in everyday life. 

The study begins by noting the increased prevalence of cannabis use today, with nearly 200 million people using it worldwide and cannabis ranking as the fourth-most-used recreational drug following caffeine, alcohol and tobacco. 

“Despite its wide use and increasing legal and societal acceptance, surprisingly little is known about its effects among habitual users in everyday life. Instead, research on cannabis tends to treat it as a drug of abuse, focused mostly on the health risks of overuse and dependence,” the study reads. “Here, we focus on what is missing, describing the everyday experience of getting high among habitual users, examining reasons they get high, its possible salutary emotional effects, and its surprising lack of costs to motivation and industriousness.”

Researchers go on to recognize that today’s cannabis users come from “all walks of life,” recognizing that most chronic cannabis users are “employed, conscientious, and have stable incomes.” Despite recent stigmatization, they also recognize that plentiful research treats cannabis as a substance involving “substantial risk,” noting that the mixed results surrounding risks of cannabis use may be the “implied goal” of much of the research: to reduce use. 

How Does Regular Cannabis Use Affect Consumers?

In an effort to get a clear picture of the effects of chronic cannabis use, the study included 3,701 observations from the daily lives of 260 recreational cannabis users. Researchers sent participants sampling surveys five times a day for seven days at random times, in which participants had up to 30 minutes to answer before the link expired.

The surveys asked participants if they currently felt high, and if not provided filler questions about cannabis cravings. If participants said they were high, the survey asked how they ingested cannabis and to select the reasons they got high. The study also utilized a modified Differential Emotions Scale to assess the extent participants felt 20 specific emotions — 10 negative and 10 positive.

Researchers also asked participants about their current levels of motivation, along with an experience sampling survey to measure levels of willpower and conscientiousness.

Overall, most participants (64%) reported feeling high, with smoking (54%), vaping (22%) and edibles (21%) as the most common methods of ingestion. The main reason driving use was liking the feeling of being high, though increasing creativity and forgetting one’s worries were also commonly reported. Many people also used cannabis to help them focus and concentrate.

Those who felt high reported feeling less fearful and stressed, compared to when they are not high. Frequent users also reported that being high increases positive emotions, awe, silliness, happiness and inspiration. However, among the cohort, those who got high “very frequently” reported more negative emotions across the board compared to those who still used frequently but not “exceptionally often” (or high on 96% of experience samples/multiple times a day).

There were mixed results surrounding conscientiousness, in that getting high “very frequently” was associated with “mostly small, yet robust reductions in people’s conscientious behaviors and traits.” Still, they note that chronic users are no less responsible or industrious than those who use cannabis less frequently.

‘Little Evidence’ of Association Between Cannabis Use, Lack of Motivation

Researchers said they found “little evidence for an association between being high and a lack of motivation among cannabis users.”

“When frequent cannabis users get high, in other words, they are no more apathetic, nor less extrinsically or intrinsically motivated to pursue their goals,” researchers said. “They are, however, slightly less motivated to do things when they are high because they would be upset with themselves if they did not do them.”

Even those who get high “very frequently,” or multiple times per day, were not less motivated than those who get high multiple times per week. In fact, researchers note that they were sometimes more motivated.

The study also touched on the “weed hangover” effect, finding that being high on the last completed survey of the day was not related to emotions on the first completed survey of the next day. There were also no significant effects of feeling high on the last survey on current levels of motivation or effort willingness, both within and across days.

“Other than a small reduction in people doing things to avoid feeling upset with themselves (introjected motivation), when chronic users got high, they were no more amotivated, no less motivated for extrinsic or intrinsic reasons, and no less willing to objectively push themselves,” researchers conclude, “Likewise, people who get high very frequently (e.g., daily) are not less motivated dispositionally than those who also get high frequently, but relatively less frequently (e.g., weekly); if anything, they are more motivated (at least for external and introjected reasons).”

The study notes that this research acts as a “real advance” over past work because it uses experience sampling, a micro-longitudinal design and large and diverse sample. Though, because participants were recruited online in forums that relate to cannabis, the results may not generalize to novice or less frequent users. 

Researchers also note that the study did not compare cannabis users to nonusers, or even frequent to infrequent users, so the study can only speak to the experience of chronic cannabis users.

“Cannabis is currently having a moment, and we expect it to only become more popular as laws and attitudes shift,” researchers say in closing. “We hope the research community will rise to the challenge of these societal shifts by attendant shifts in research philosophy that has been too quick to pathologize use.”

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