Can Weed Cause Hair Loss? Facts and Myths Debunked

Medically reviewed by Dr. Bilal Khan M.B.B.S.
Written by Our Editorial Team
Last updated

In the vast world of marijuana-related queries, one question that often emerges is, "Can weed cause hair loss?" The relationship between marijuana and hair health has been a topic of intrigue and uncertainty for many users and researchers alike. While there are several anecdotal accounts and some scientific studies, a definitive answer has yet to be confirmed. This article aims to provide an in-depth analysis of the existing evidence and offer a comprehensive view on this topic.

Can Weed Cause Hair Loss?

A direct answer is complex due to limited research, but some studies and observations suggest that regular marijuana use may potentially contribute to hair loss. Weed could indirectly affect hair health through hormonal changes, stress, and reduced cellular activity. Yet, it's essential to note that many regular users do not experience hair shedding, pointing to the need for more research in this area.

Weed can cease the lengthening of hair and affect hair health although it does not directly cause hair loss.

The Connection Between Marijuana and Hormonal Changes

One of the primary ways marijuana might impact hair health is through hormonal changes. THC, the active ingredient in marijuana, can alter hormone levels in the body, potentially leading to conditions such as hair loss. A study conducted suggested that THC deposition onto hair shafts might prohibit hair elongation and suppress the distribution of hair follicle proteins.

Marijuana, Stress, and Hair Loss

Another potential link between marijuana use and hair loss is stress. The body produces stress hormones when under physical or mental pressure, which can lead to hair shedding. While marijuana is often used for its calming effects, paradoxically, it may also contribute to stress, thereby indirectly causing hair loss.

Reduced Cellular Activity and Hair Loss

There is some indication that marijuana use may slow down cellular activity, which could impact hair growth. Healthy hair growth relies on active cell division and any disruption in this process could potentially lead to hair loss.

Controversy and Conflicting Opinions

Despite some links suggesting a connection between weed and hair loss, it's important to consider conflicting opinions. There is a wealth of anecdotal evidence indicating that many regular users do not experience hair shedding, and some even report thicker hair. There are also professionals who regard marijuana as a non-toxic substance with various therapeutic properties.


In conclusion, the question, "Can weed cause hair loss?" remains partially answered due to limited scientific evidence. Some studies suggest that marijuana may contribute to hair loss indirectly through hormonal changes, stress, and slowed cellular activity. However, many users do not report hair loss, and further research is needed to provide a definitive answer. As always, if you notice any unusual hair loss, it is best to consult with a healthcare professional to explore potential causes and treatments.

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Dr. Bilal Khan M.B.B.S. graduated from the Jinnah Sindh University in Karachi. He'll take the official medical licensing program in the US (USMLE) in September 2023. Bilal has a passion for research and has extensively fact-check and medically review articles under his name to make sure you have the most accurate information.