A Cancer Patient Developed a Dangerous Lung Fungal Infection Possibly Linked to Contaminated Marijuana | Research

The takeaway

A patient using illicitly obtained marijuana as an antiemetic during lung cancer chemotherapy developed invasive pulmonary aspergillosis, highlighting the infection risk of smoking contaminated marijuana while immunocompromised.

Read this if you are immunocompromised and considering using cannabis, or if you work in medical cannabis regulation.

Invasive pulmonary aspergillosis in an immunocompromised marijuana user

What the researchers found

A patient with small cell lung cancer was using illegally obtained marijuana to control nausea during combination chemotherapy. During treatment, the patient developed invasive pulmonary aspergillosis, a serious and potentially fatal fungal lung infection.

Marijuana samples have been shown to contain bacterial and fungal contaminants, including Aspergillus species. When an immunocompromised patient, whose immune defenses are already weakened by chemotherapy, inhales contaminated marijuana smoke, those contaminants gain direct access to vulnerable lung tissue.

The researchers acknowledged the patient had multiple risk factors for aspergillosis beyond marijuana use, including chemotherapy-induced immunosuppression. They could not definitively attribute the infection to marijuana alone. However, they emphasized that the infectious potential of inhaled marijuana in immunocompromised patients is a real and underrecognized risk.

Why it matters

This case report highlighted a specific harm-reduction concern: marijuana contamination with fungi poses minimal risk to healthy users but potentially serious risk to immunocompromised patients. This distinction became increasingly relevant as medical marijuana programs expanded to include cancer patients.

The numbers in context

One patient with small cell lung cancer. Multiple risk factors for aspergillosis. Marijuana obtained illicitly (unregulated, untested for contaminants).

How the study worked

Case report of a single patient who developed invasive pulmonary aspergillosis while using illicitly obtained marijuana during cancer chemotherapy. Clinical findings and risk factors were documented.

What this study cannot tell us

A single case report cannot establish causation. The patient had multiple risk factors for aspergillosis. The marijuana was not tested for contaminants. No control comparison was possible.

How to read the evidence

A single case report documenting a clinical observation. Valuable for hypothesis generation but cannot establish a causal relationship.

When this study was published

Published in 1986. Modern regulated cannabis programs include contaminant testing that could mitigate this specific risk.

The bigger picture

This case contributed to the argument for regulated, tested marijuana rather than illicit sources, particularly for medical patients. Modern medical cannabis programs typically require testing for mold, fungi, and other contaminants, addressing exactly the kind of risk documented here.

Questions still open

How prevalent is Aspergillus contamination in illicit marijuana? Would regulated, tested medical marijuana eliminate this risk? Should immunocompromised patients avoid smoked cannabis entirely regardless of source?

Common questions

Did marijuana cause the lung infection?

It may have contributed. The patient had multiple risk factors, and the researchers could not definitively attribute the infection to marijuana alone, but contaminated marijuana is a plausible source of Aspergillus exposure.

Is this a risk for all cannabis users?

No. This risk is specific to immunocompromised patients (such as those on chemotherapy) who inhale contaminated cannabis. Healthy immune systems can typically handle the low levels of fungal spores found in marijuana.

Read the original research

Possible risk of invasive pulmonary aspergillosis with marijuana use during chemotherapy for small cell lung cancer.

Drug intelligence & clinical pharmacy, 20(4), 289-91

View on PubMed ↗

Citation

Sutton, S; Lum, B L; Torti, F M. (1986). Possible risk of invasive pulmonary aspergillosis with marijuana use during chemotherapy for small cell lung cancer.. Drug intelligence & clinical pharmacy, 20(4), 289-91.