New study investigates the combined effects of marijuana and tobacco

NCT ID NCT05999383

Recruiting now Knowledge-focused Sponsor: University of California, San Francisco Source: ClinicalTrials.gov ↗

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at what happens when people who regularly use both marijuana and tobacco use them together. Researchers will measure how much THC and nicotine get into the blood and how the body responds. The goal is to better understand the health effects of using both substances at the same time.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: Cannabis (marijuana) and nicotine (tobacco)
What this could lead to: If successful, this study could help clarify the health risks of using marijuana and tobacco together, guiding future public health recommendations.
What could go wrong: This is an early-phase study with only 48 participants, so results may not apply to everyone. It focuses on measuring drug levels, not on treating any disease.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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Conditions

The condition(s) this trial relates to.

cannabis dependence Marijuana Smoking nicotine dependence thrombocytopenia 1 Tobacco Use Vaping

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

CANNABIS CANNABIS SMOKING CANNABIS USE THC TOBACCO USE VAPING

Contacts and locations

Locations

Zuckerberg San Francisco General Hospital
RECRUITING

San Francisco, California, 94110, United States

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