Hair Loss

Does Smoking Marijuana Cause Hair Loss?

This post will discuss the effects that chronic marijuana use may have on hair loss. This will include a look at the two major ways that cannabis can affect hair health and available scientific data.

Marijuana: A Cure-All or Threat?

Cannabis, or marijuana, is a popular recreational drug slowly finding its legal footing in a number of countries, including the United States, Canada, Portugal, the Netherlands, and Spain.

While many tout the drug as a cure-all, its advocates often gloss over the negative consequences of cannabis consumption.

One ill effect not commonly talked about is hair loss.

Two Ways Regular Marijuana Use Can Be Linked to Hair Loss

The effects of marijuana on hair health can be divided into two categories.

Direct physiological effects

The majority of cannabis users smoke the plant, either on its own or mixed with tobacco. Either way, the combustion is involved leads to the release of thousands of harmful substances. These are absorbed by the bloodstream and travel throughout the body.

There are recent studies suggesting that chronic smokers do suffer from an increased risk of developing pattern baldness. For example, a population survey out of Taiwan found regular smoking was a predictor of pattern baldness among men, while another one out of Jordan found regular smokers were more likely to develop prematurely gray hair before turning 30 (1, 2).

These studies were performed with regular tobacco users, but the results almost certainly carry over to cannabis users for two reasons. Firstly, the chemical composition of tobacco and cannabis is qualitatively similar, and the large majority of cannabis smokers mix it in with tobacco (3).

Researchers studying the direct physiological effects of cannabis on the hair follicles are also making headway. The take-away message is that cannabis consumption negatively affects follicle cell growth.

Cannabinoid receptors are located throughout the body, and they are involved in many physiological processes. These include appetite, pain-sensation, mood, and memory.

The body produces its own cannabinoids – known as endocannabinoids – which attach to receptors in various organs, including the hair follicles. THC found within marijuana is known as an exocannabinoid, and it attaches to the receptors just like endo-cannabinoids do.

A study performed in 2007 by researchers at the University of Debrecen found that endo- and exocannabinoids inhibit the growth of the human hair follicle (HF) (4).

As discovered by the researchers, “the prototypic endocannabinoid, AEA (which may even be produced within human HF), and … the exocannabinoid, THC, both inhibit human hair shaft elongation and induce apoptosis-driven HF involution (catagen) in vitro.”

A side-by-side comparison of hair shaft length in the control group and AEA (cannabinoid) group
A side-by-side comparison of hair shaft length in the control group and AEA (cannabinoid) group. Source.

In simplest terms, taking in cannabinoids can inhibit the proper development and growth of the human hair shaft and induce hair loss.

A graph showing the effect that cannabinoids have on hair growth cycle

As can be seen above, this increases the percentage of hairs in the catagen or involution phase of the hair cycle. As the amount of exocannabinoid increases, so too does the percentage of hair follicles in the catagen phase.

Lifestyle effects

Cortisol is a hormone produced within the human body during periods of stress. Contrary to popular belief, THC (tetrahydrocannabinol) can increase cortisol levels (5).

In relation to hair loss, this may precipitate a condition known as telogen effluvium.

Telogen effluvium is an acute form of hair loss that occurs when the hair follicles enter the telogen phase of the cycle prematurely. It can be due to various reasons (illness, injury, medications, extreme diets), but stress is an underlying thread in many of them.

Another indirect way in which regular cannabis use can affect hair health is through the nutritional choices its users make. It is known that being high can lead to binge eating, the consumption of junk food, and weight gain (6).

Finally, if you are suffering from hair loss, then the obvious first step to stopping or reversing it is being motivated to do so. The best way of dealing with hair loss is through a multi-pronged approach that will involve changes in diet, lifestyle, shampoo, the use of supplements, etc.

To do all this you need to be sufficiently motivated and organized.

Scientists confirm that marijuana use can decrease motivation, and they have even given this condition a name: cannabis amotivational syndrome (7).

What About Cigarette Smoking?

Two significant studies have been conducted so far, investigating the link between hair loss and smoking. Both came to the same general conclusion; yes, smoking does cause hair loss.

Or to put that in scientific jargon, there is “a significant relationship between smoking and baldness” as the 2003 study stated.

The 2007 study came to a similar conclusion stating in the abstract, “After controlling for age and family history, statistically significant positive associations were noted between moderate or severe AGA (Androgenetic Alopecia) and smoking status, current cigarette smoking of 20 cigarettes or more per day, and smoking intensity.”

Both studies conclude the reasons for smoking as a cause of hair loss as multifactorial, meaning there are more than one reason that smoking would go on to cause hair loss, speaking from a biological perspective.

Here Are Some of the Possible Reasons the 2003 Study States:

  1. The effects of cigarette smoke on the microvasculature of the dermal hair papilla.
  2. Genotoxicants causing damage to DNA of the hair follicle.
  3. Smoke-induced imbalance in the follicular protease/antiprotease systems controlling tissue remodeling during the hair growth cycle.
  4. Pro-oxidant effects of smoking leading to the release of pro-inflammatory cytokines resulting in follicular micro-inflammation and fibrosis and finally increased hydroxylation of oestradiol as well as inhibition of the enzyme aromatase creating a relative hypo-oestrogenic state.

You may not necessarily want or need to understand the scientific jargon to come to the conclusion that, through various mechanisms, we can be fairly confident that smoking will cause or speed up hair loss.

Sure, there are plenty of people who smoke who don’t suffer from pattern baldness, but that’s beside the point.

I personally used to smoke socially now and again but have given up because I was worried it was affecting my hair.

Smoking is associated with premature ageing. Hair loss (and indeed hair greying!) is also associated with ageing, so it makes sense that smoking and hair loss would be connected in some way.

Toxins entering the body through the lungs from polluted air, plus the damage from free radicals are two ways that smoking causes premature ageing.

Does Nicotine Contribute to Hair Loss?

There are various ‘ingredients’ found in a cigarette, but perhaps the most well known is nicotine. This substance belongs to the nightshade family, and it makes up 0.6% to 3.0% of tobacco’s dry weight.

But the question is, does nicotine play a role in hair loss?

It doesn’t directly cause hair loss, but it does lead to poor health. These can indirectly contribute to hair loss. How?

Foremost, nicotine decreases oxygen levels.

With less oxygen to go around, there’s less that will be delivered to the scalp and hair follicles. This is because vital organs, such as the heart and brain, must be supplied first.

Nicotine also lowers immunity, which can be a trigger for individuals susceptible to Alopecia Areata (AA). It can also lead to the development of many scalp conditions, such as dandruff and seborrheic dermatitis.

This substance can also increase blood pressure and age the skin.

(Learn more about nicotine, and its role in hair loss, here.)

What You Can Do to Combat Marijuana-Linked Hair Loss

If you are concerned that your hair loss is linked to marijuana use, there are a few things you can do to address this.

Decrease Marijuana Usage

Marijuana buds poured out onto a prescription pad

While stopping use altogether may yield more significant results, many users are wary of doing so. This is especially true for those using marijuana for medicinal purposes.

If you use marijuana medicinally, stopping the drug entirely may cause the medical condition you are treating to flare up again. The sensible option is to reduce consumption to a level that allows the symptoms of the condition to stay under control while also lowering the adverse effects of the drug itself.

Consume Cannabis Differently

A large part of the damage done by cannabis is related to the harmful chemicals, including many carcinogens, released during the process of combustion.

THC vaping raises even more concern because the product is likely synthetic THC. There have not been long term studies to know the true effects of synthetic versus plant-based THC.

Perhaps one of the safer ways to consume cannabis is by consumption of edibles. Related to edibles are cannabis oils, which are simply concentrated forms that are typically consumed in capsules. This avoids the issues caused by combustion and vaping, though users must be careful of dosage when consuming orally.

Increase Nutritional Intake

As mentioned above, a common side effect of THC intake is poor nutritional choices and increased consumption of junk foods like processed carbs and sugary snacks.

Fortunately, this can be alleviated by ensuring that your body receives the micronutrients it desperately needs in the form of vitamins and minerals.

An easy way to increase nutritional intake is to consume a diet of colorful fruits and vegetables.

Vitamins and nutrients are abundant in fresh fruits and vegetables

Such foods contain vitamins A, B, C, and D, niacin, iron, magnesium, calcium, and so much more.

(Learn more about the best diet for hair growth.)

Find the Root Cause

While it is very possible that marijuana can contribute to hair loss in some individuals, it will usually not be the main factor.

From genetic predisposition to chronic illness to medication, there are many causes of hair loss. It is crucial to first identify the type of underlying hair loss.

Slow, chronic hair loss starting at the temples is the hallmark of pattern baldness, which is linked to androgens (and DHT in particular) attacking the hair follicle.

On the other hand, sudden onset, acute hair loss is usually related to telogen effluvium or alopecia areata. The cause of these, and especially telogen effluvium, is often an environmental trigger like a disease, medication, nutritional deficiency, or acute stress.

Other potential causes of hair loss are hormonal imbalance, or you could have an underlying condition contributing to the issue. These can be ruled out by a physician.


The relationship between marijuana and hair loss is largely unknown. However, it is almost certain that giving up on the use of marijuana will have no ill effect on the health of your hair. In fact, it may even benefit it.

One factor that cannot be overstressed is there will be significant individual differences. Cannabis is a substance to which people have dramatically different emotional and physiological responses.  It seems almost certain these differences will also impact the way the internal organs – including the hair follicles – respond to this drug.

Marijuana laws differ from state to state and from country to country. Possession still involves prison in some places and is not worth the risk. Know your local laws. Those under 25 should avoid use because of concerns about learning and memory changes to the brain.

In summary, if you are determined to increase your chances of stopping or even reversing hair loss, then quitting or at least lowering the consumption of cannabis is one place to start.

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You can follow a few hair hygiene tips to make your hair less likely to fall out: Avoid hairstyles that pull on the hair - Avoid high-heat hair styling tools - Don't chemically treat or bleach your hair - Use a shampoo that's mild and suited for your hair - Use a soft brush made from natural fibers - Try low-level light therapy.

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