Cannabis and mental heath: key facts

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For many of us, cannabis is a way to relax – 2 million people in the UK smoke it and half of all 16 to 29 year olds have tried it. But research suggests that it can cause problems in some vulnerable people.

How does cannabis work?

When smoked, cannabis from the lungs goes into the blood and is carried to every part of the body. Several chemicals in cannabis bind to receptors in areas of the brain that deal with pleasure, memory, thought, concentration and the awareness of time. There are two main kinds of chemical involved:

A group called the cannabinoids, which seem to give you the more pleasant effects - feeling relaxed, happy, sleepy, with colours appearing more vivid and music sounding better.

THC, which seems to produce hallucinations, anxiety and paranoia.

These feelings don't usually last long – although as the drug can stay in your system for some weeks, subtle effects can last a few days. Long-term use can make you depressed and make you less motivated.

What is the risk to mental health?

Depression
1600 Australian children aged 14 to 15 were studied for seven years. The ones who used cannabis every day were 5 times more likely to become depressed and anxious by the end of the study.

Schizophrenia
If you start smoking cannabis before 15, you are 4 times more likely to develop a psychotic illness.

The more cannabis you use, the more likely you are to develop psychosis.

It isn't clear why cannabis use in adolescence seems to have such an effect, but it may be because the brain is still developing.

Is there such a thing as ‘cannabis psychosis’?

Some people seem to get a short period of psychosis that is brought on by cannabis but which stops soon after the cannabis is stopped.

If it's so dangerous, why don't more of my friends get unwell?

Probably because most people don't use cannabis before they are 15 and don't go on smoking large amounts. Psychotic illness is quite unusual anyway – only about 1 in 200 people have it at any given time. Most of us probably don't know that many people so, even if cannabis does increase the risk, you aren't likely to notice an ”epidemic” amongst the people you know.

What about other effects?

Education: the connection isn't clear, but regular cannabis use does seem to affect how you do at school or college.
Employment: cannabis users are more likely to leave work without permission, spend work time on personal matters or daydream. Regular users report that it has interfered with their work and social life.
Driving: a recent study in France showed that cannabis users are more than twice as likely to be the cause of a fatal crash than to be one of the victims.


Is cannabis addictive?

It has some of features of addictive drugs – a regular user has to take more and more to get the same effect (tolerance) and can get withdrawal symptoms.
3 out of 4 long-term users get cravings, half become irritable and 7 out of 10 switch to tobacco to try to stay off cannabis. Many find that they spend much of their life seeking, buying and using it. It is probably about as hard to stop as tobacco.

What about skunk and stronger varieties of cannabis?

The amount of the main active ingredient, THC, in herbal cannabis varies from 1% up to 15%. The newer strains, including skunk, can have up to 20%. On the whole, the newer varieties are probably about 2 or 3 times stronger than those available 30 years ago. They make you relaxed and cheerful more quickly, but also produce more unpleasant effects.

How can I cut down my use of cannabis?

The Home Office has published a guide on cutting down and stopping. It suggests that you:
write down your reasons for wanting to change
plan how you will change
plan how to cope with withdrawal symptoms
have a back-up plan.
You can also work through the leaflet on the FRANK website.

What other support can I get?

Join a support group like Marijuana Anonymous UK

http://www.rcpsych.ac.uk/expertadvice/problems/alcoholanddrugs/cannabismentalhealthkey.aspx

ekt_bear: Marijuana is the only reasonably safe drug. And even being addicted to it is pretty bad.

kunletech:

My bros, u are wrong.
These are d children marijuanna producess when u are taking it:
1. It decreases d efficience of cognitive processing
2. It weaken d body immune respone
3. It decrease d action of male sex organ hormones
4. It cause long cancer
5. If u are cought smoking it, u end up in jail, cos is not legal in Nigeria

ehie: weed is used in treat terminal patients with hiv or cancer who have problems with nausea and suppressed appetite,cannabis has some medical benefits ,pls do not miseducate the public.people r figthing for its legalization.there is a thing called medical marijuahana

ejifranks: u smoke weed

ehie: no,i just know a lot of things

feminine A: What I still don't understand is how drugs destroy some people and the other people are just normal

ichidodo: are u a doctor?

jackbauersballs: Like anyone in Nigeria has access to Crystal Meth Anyway...

Boys and Girls please don't do drugs....Without Me...

ehie: actually a meth lab was raided in lagos or enugu some months back,there was a falling out between the partnerd and one went to ndlea to report it,heaven knows how many more we have

frosbel:

Nonsense.

I have seen people run mad because of marijuana , and guess what , 99% of all heroine, cocaine and meth users started off with marijuana .

Why would you want to take marijuana anyway or any other drug for that matter, can you not operate under normal conditions

rick.ross:
I really really want to know, why do people do drugs? Is cocaine sweet like sugar? I cant even smoke cigar talkless of coke...

topsyking: Forget that level jare....IGBO is good for the body...I recommend Igbo for moderate smoker

ehie: weed is used in treat terminal patients with hiv or cancer who have problems with nausea and suppressed appetite,cannabis has some medical benefits ,pls do not miseducate the public.people r figthing for its legalization.there is a thing called medical marijuahana

ehie: the drug op is posting about is crystal meth,and the third pic showing the disfigured woman,the woman's meth lab blew up in her face..meth is cheaper than coke or heroin,that is why its the drug of choice,on meth you lose appeite and dont eat and ur body starts eating itself,causing muscle wastage.

ehie: weed is used in treat terminal patients with hiv or cancer who have problems with nausea and suppressed appetite,cannabis has some medical benefits ,pls do not miseducate the public.people r figthing for its legalization.there is a thing called medical marijuahana

ifyalways: Scary!