New Study Finds Weed May Alter Genes Like Cigarettes Do

A new study suggests marijuana may have genetic impacts more similar to tobacco than previously thought. While cannabis is widely praised for its therapeutic potential—used to manage pain, anxiety, sleep issues, seizures, and more—new research calls for a deeper look at its long-term health effects.

According to a study published in Molecular Psychiatry, scientists found that regular cannabis use was associated with multiple epigenetic changes—chemical modifications that influence how genes are expressed without changing the underlying DNA. These kinds of changes are already well-known in smokers, where cigarette use has been linked to increased risks of cancer, heart disease, and other age-related conditions. Now, similar concerns are being raised about marijuana.

Northwestern Medicine’s senior study author Lifang Hou explained that “cumulative marijuana use” was linked with markers also found in tobacco users. Some of these markers are tied to immune function, mental health, and even cell growth. Drew Nannini, first author of the study, emphasized that more research is needed to understand how these changes might affect different populations and how they may play into diseases associated with aging.

The science of epigenetics—how environmental factors like diet, Pollution, or smoking alter our gene expression—is still unfolding. According to the National Library of Medicine, these influences may lead to serious conditions like cancer and neurodegeneration, even if your DNA code stays the same.

As public Support for marijuana legalization continues to grow—with Pew Research reporting 9 in 10 Americans in favor—it’s vital to pair enthusiasm with informed caution. Legal doesn’t always mean risk-free.

If you’re using cannabis, consider how you consume it and why. Opting for smoke-free methods like edibles or vaporisers, or choosing organic, pesticide-free sources can help reduce harm. And as always, prioritise plant-based, low-tox lifestyles that truly Support both people and the planet.

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