Is detoxing from cannabis dangerous?

Withdrawal from cannabis isn’t typically dangerous or life-threatening but it can expose underlying mental health conditions. People who’ve used cannabis for a long time will find withdrawal symptoms much more severe and choosing to detox in a private rehab facility is therefore usually the safest option.

Cannabis Detox Treatment at Delamere

UK’s only purpose-built addiction clinic
Drug detox and rehabilitation programmes
Intensive therapy programmes
Exceptional accommodation
15 months of aftercare

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Doctify Outstanding Patient Experience 2026

Psychiatrist at Delamere

Dr Catherine Carney

March 12, 2026

What is a cannabis detox?

The detoxification process is designed for people who want to stop taking cannabis completely. A cannabis detox gently weans the body off drugs under medical supervision to end the physical addiction to Tetrahydrocannabinol (THC), the intoxicating substance found in cannabis.

Why is detox recommended for cannabis?

THC is what makes cannabis addictive. It rewires the brain’s reward system by stimulating neurons to release chemicals that make us feel happy. After a while, the brain starts to rely on the THC in cannabis to feel good. This leads to cannabis addiction. The only way to break the cycle is with a full medical detox from cannabis.

Who needs a cannabis detox?

Anyone who feels they’ve become dependent on cannabis would benefit from a detox. You might feel you want to reduce your tolerance and reset your system for health and wellbeing reasons. Perhaps your use of cannabis is starting to affect your work, school or family life. If your relationship with cannabis is taking over your life, it’s time to get help.

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What happens during cannabis detox?

Initial stage

Because the THC in cannabis is stored in fat cells it can stay in the body longer than water-soluble solutions – sometimes for days or weeks. For short-term users of cannabis, the detox process will be quicker.

Elimination process

During detox, the body begins to break down and eliminate THC through urine, sweat and breath. You will be supported with fluids, medication and nutritional supplements during this phase to help balance your body’s physiological functions.

Withdrawal symptoms

As your THC levels begin to drop withdrawal symptoms will start to kick in. These usually peak around days 4-7. After two weeks the worst of the side effects will have subsided and you’ll be feeling more energised, alert and rejuvenated.

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Our approach is person-centred and holistic. That means we understand that each person is unique and we don’t subscribe to a one-site-fits-all philosophy.

Martin Preston Founder & CEO

Our 4-phase holistic cannabis rehab programme

An in-patient stay at Delamere is a deliberately intensive 4-phase drug rehab programme which we’ve crafted over time to help many people recover.
We start by taking you through a safe and assisted cannabis detox supervised by our Delamere team of passionate therapists, doctors, nurses, counsellors, and support staff, some of whom have lived experience of addiction.

Stop

This phase addresses any physical aspects of your addiction. Our medical team is on hand 24/7 to ensure a safe and effective withdrawal.

Start

During ‘Start’ we help identify the psychological underpinnings of your dependency as you participate in a variety of addiction treatment therapies.

Grow

Our ‘Grow’ phase is the process of integrating the Delamere learning experience into life after treatment.

Bloom

Our ‘Bloom’ phase offers intensive support on a weekly basis for the first three months of recovery once guests return home.

Our Treatment Model Our Environment

What are the withdrawal symptoms with cannabis?

Withdrawal symptoms will vary depending on how long you’ve been taking cannabis and how your body responds to treatment.

To make cannabis withdrawal as comfortable as possible we approach marijuana detox on an individual basis. This ensures the process is as smooth and pain-free as possible.

Side effects of cannabis withdrawal include:

Cravings
Irritability and mood swings
Sleep problems or nightmares
Sweating and shaking
Lack of appetite
Restlessness
Physical discomfort

Without a medically supervised detox, cannabis withdrawal symptoms can be unpleasant. Under our supervision, we can help to manage the various psychological and physical symptoms and make them less challenging.

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How to encourage a loved one to detox from cannabis

When someone is addicted to drugs, everyone suffers. Whether it’s a relative, friend or someone at work, addiction, their dysfunctional behaviour affects those closest to them.

If you’re worried about a person’s drug taking and would like to find out more about cannabis rehab in a private clinic, Delamere is here to help. We offer family support services to help your loved one confront addiction.

We can also help you to get the conversation started with intervention services that encourage your loved one to enter drug rehab treatment with us.

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Frequently Asked Questions

THC can linger in the system for many weeks, especially for long-term users of cannabis. The length of time it takes for you to detox will depend on several factors, from your metabolism and body fat percentage to how frequently you used cannabis. A cannabis detox at Delamere usually takes one to two weeks as part of a minimum 28-day in-patient residential stay. However, longer programmes are available, if necessary.

While detoxing from cannabis at home is possible, it is much harder to do alone and often leads to relapse. This is where a residential cannabis detox at Delamere can really help as you’ll have dedicated 1-2-1 medical supervision. This ensures you’re safe, comfortable and receive the correct pharmacological, nutritional and emotional support throughout the entire detox process.

Cannabis detox helps to reduce cravings by eliminating THC from the body. This resets the brain’s reward system, helping you to feel more mentally focused and less reliant on cannabis to feel calm and in control. With additional support from one-to-one therapy and group counselling sessions, you’ll also be able to overcome the triggers that led to cannabis cravings in the first place.

It’s important to eat a healthy, balanced diet during detox that includes a mix of fresh fruits, vegetables and healthy fats. At Delamere, you will have homecooked meals that are specially prepared to support your nutritional needs during the detox process. The best options during detox include high fibre, protein-rich and nutrient-dense foods with high water content to help balance fluids.

Medicinal cannabis can be prescribed for certain conditions, such as epilepsy and multiple sclerosis. It’s only ever offered to patients when other treatments have failed. This type of cannabis only contains CBD (cannabidiol) which has a low potential for addiction in comparison to THC contained in cannabis. It is only ever prescribed in a low dose under close medical supervision.