Cannabis Tolerance Developed Rapidly and Withdrawal Symptoms Appeared After Just One Week of Use | Research

The takeaway

A review of 120 research subjects found tolerance to cannabis developed and faded quickly, while withdrawal symptoms including irritability, insomnia, and tremor appeared after as few as seven days of THC use.

Read this if you use cannabis regularly and want to understand how your body adapts to repeated use and what happens when you stop.

Withdrawal symptoms appeared after as few as 7 days of THC administration

What the researchers found

Drawing on data from 120 research subjects, this review documented how the body adapts to repeated cannabis exposure and what happens when use stops.

Tolerance developed to multiple effects: cardiovascular changes, lowered eye pressure, sleep disruption, mood changes, and behavioral effects. This tolerance was acquired rapidly under consistent dosing and was also lost rapidly when dosing stopped. The mechanisms appeared primarily functional (the brain adapting its response) rather than metabolic (the body breaking down THC faster).

Withdrawal symptoms emerged after as little as seven days of THC administration. The syndrome included irritability, restlessness, insomnia, loss of appetite, nausea, sweating, increased salivation, elevated body temperature, tremor, weight loss, and changes in both sleep and waking brain wave patterns. While described as "mild and transient" in the 120 subjects studied, the syndrome resembled withdrawal from sedative drugs.

The review raised a clinically important concern: if tolerance develops to therapeutic effects, chronic medical use could become less effective over time.

Why it matters

This review established that cannabis tolerance and withdrawal were real, measurable phenomena, countering claims in both directions: that cannabis was completely non-addictive, or that it produced severe dependence. The finding that therapeutic tolerance could undermine medical use remains relevant to modern medical cannabis prescribing.

The numbers in context

120 research subjects studied. Withdrawal appeared after as few as 7 days of THC use. Tolerance development rate depended on dose and dosing schedule.

How the study worked

Review of clinical data from 120 research subjects who received THC under controlled conditions. The review synthesized findings on tolerance acquisition and loss, withdrawal symptoms, and clinical implications.

What this study cannot tell us

Data from controlled research settings may not reflect real-world usage patterns. The 120 subjects likely represented a relatively homogeneous population. Withdrawal was described as mild and transient, which may underestimate severity in heavier or longer-term users.

How to read the evidence

A review synthesizing controlled clinical data from 120 subjects. The sample size and controlled conditions add credibility, but the review format limits detailed methodology assessment.

When this study was published

Published in 1981. Modern cannabis products are substantially more potent, which may affect both tolerance development and withdrawal severity.

The bigger picture

Published four years before dronabinol's FDA approval, this review raised questions about long-term medical cannabis use that are still being investigated today. The concept of "cannabis use disorder" recognized in modern diagnostic criteria builds partly on the withdrawal syndrome documented here.

Questions still open

How does tolerance progression in controlled settings compare to naturalistic use? Can dosing strategies minimize therapeutic tolerance? Does the withdrawal syndrome worsen with longer use periods or higher potency products?

Common questions

What were the withdrawal symptoms?

Irritability, restlessness, insomnia, loss of appetite, nausea, sweating, increased salivation, elevated body temperature, tremor, weight loss, and changes in brain wave patterns during sleep and waking.

How quickly did tolerance develop?

Tolerance was acquired rapidly under consistent dosing and was also lost rapidly when dosing stopped. The rate depended on dose size and schedule.

Read the original research

Clinical relevance of cannabis tolerance and dependence.

Journal of clinical pharmacology, 21(S1), 143S-152S

View on PubMed ↗

Citation

Jones, R T; Benowitz, N L; Herning, R I. (1981). Clinical relevance of cannabis tolerance and dependence.. Journal of clinical pharmacology, 21(S1), 143S-152S.