Can a common supplement help you quit both tobacco and weed?
NCT ID NCT04627922
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tested whether N-acetylcysteine (NAC), an over-the-counter supplement, can help people who use both tobacco and cannabis quit both substances. Fifty-nine regular smokers who also used cannabis took either NAC or a placebo for 8 weeks. Researchers tracked how often they used each substance and checked for abstinence using saliva tests.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
N-acetylcysteine (NAC)
What this could lead to
If it works, this could point toward a treatment for people who want to quit both tobacco and cannabis.
What could go wrong
This is a small, early-phase trial with only 59 participants. The supplement may not work better than a placebo, and results may not apply to everyone.
Disclaimer
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This is a summary of
the original study
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
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Locations
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San Francisco Veterans Affairs Medical Center
San Francisco, California, 94121, United States