Does Marijuana Cause Hair Loss? Here’s What The Science Says

When you think about weed’s effects, things like mood changes, altered senses, or even erectile dysfunction (ED) might come to mind. But does marijuana cause hair loss?

The research is limited, but there might be a connection between smoking weed and hair loss.

Below, we break down what science has to say, what could really be going on with your hair, and what you can do about hair loss.

Short answer: Not really.

There’s no solid scientific evidence that cannabis directly causes hair loss. But before you light up or pop an edible, there are a few things to consider.

While weed isn’t likely to make your hair fall out on its own, it can indirectly affect your hair through things like diet, stress, and hormones — all of which play a role in hair growth.

Appetite Changes

Let’s talk about the munchies. ​​Tetrahydrocannabinol (THC) — the psychoactive compound in marijuana that gets you high — can mess with your appetite.

If you’re swapping balanced meals for nutrient-poor snacks, you might miss out on key hair-friendly nutrients like protein, iron, vitamin D, and biotin. Your hair needs these to grow strong and healthy. And a deficiency can weaken hair follicles and lead to increased shedding over time.

Hair Growth Cycle Impact

Your hair isn’t always growing. The hairs on your head go through phases of the hair growth cycle at different rates. The rest (telogen) phase is when hair sheds to make room for new hair.

Stress, hormonal imbalances, and health changes can push more hairs into the shedding phase. This type of hair loss is called telogen effluvium.

Some studies suggest cannabis may affect the endocrine system, which regulates hormones like cortisol (the stress hormone) and testosterone. In theory, this could impact the hair growth cycle.

Smoke and Scalp Health

Smoking anything, including weed, releases toxins that can cause oxidative stress. This can damage hair follicles and the hair shaft itself over time, making hair more brittle and prone to breakage.

THC can bind to CB1 receptors in your hair follicles, possibly interrupting the hair growth cycle and causing early shedding. Edibles, which often contain higher THC concentrations, might have a stronger impact on hair growth than smoking. But the science isn’t fully clear on this yet.

On the flip side, cannabidiol (CBD), another prominent compound in cannabis, might do the opposite. It can block those same receptors and may even help promote hair growth. Most weed products contain both THC and CBD, but it’s still not completely clear how they interact to affect hair growth.

This is where things get tricky. Hair loss can have many different root causes — genetics, hormone changes, stress, diet, and more.

While research suggests marijuana isn’t a direct cause of hair loss, it might play an indirect role. Smoking can affect your body in ways that contribute to shedding, but it’s rarely the only factor at play.

Noticing thinning, excess shedding, or a receding hairline? Ask yourself:

• Have I started or increased my marijuana use recently?

• Am I under more stress, sleeping less, or eating differently?

• Do I have a family history of hair loss?

A healthcare professional is the only person who can confirm the root cause of hair loss — and whether weed has anything to do with it.

When you’re ready to tackle hair loss, Hims can connect you to a healthcare provider who specializes in hair loss treatment.

Your first step should be to see a healthcare provider. They can recommend the best path forward.

They may recommend lifestyle changes like cutting back on marijuana use. They can also go over your hair loss treatment options.

Marijuana Hair Loss Treatments

No product can reverse marijuana-related hair loss overnight. But the following science-backed treatments can help support overall hair health, regardless of what’s causing your shedding:

• Minoxidil. This FDA-approved hair loss medication is available over the counter. Minoxidil helps stimulate blood flow to hair follicles.

• Finasteride. This prescription medication blocks dihydrotestosterone (DHT), a hormone linked to hair thinning in men. Hims can connect you to a provider who can prescribe you finasteride.

• Multivitamins. An unbalanced diet can lead to nutrient deficiencies. Supplements containing biotin and other nutrients can help give you what you're missing to support healthy hair growth.

Not sure where to start? Hims offers hair care bundles and online consultations with licensed providers who can help build a custom plan just for you.

Maybe. But it depends on why you’re losing hair.

If your hair loss is caused by smoking-related stress on your body, quitting could help. And your hair might start growing back within a few weeks to months.

But if your hair loss is due to something more permanent, like androgenetic alopecia (male pattern baldness), quitting smoking likely won’t bring your hair back.

Thankfully, treatments like finasteride and minoxidil can help slow hair loss and even regrow some hair.

Hair loss is frustrating, and it’s normal to want answers. Let’s recap what we know about marijuana hair loss:

• No research has shown marijuana to be a direct cause of hair loss. But it could be a contributing factor depending on your lifestyle, diet, and overall health.

• Most hair loss from lifestyle factors is reversible. If smoking or stress is thinning your hair, you might be able to reverse the damage by adopting hair-friendly habits.

• Hair loss unrelated to smoking requires early treatment. The sooner you address male pattern hair loss, the better. Treatments like minoxidil and finasteride can help slow hair loss and preserve the hair you have.

Need help getting started? Hims can connect you to a provider who specializes in hair loss treatment.