Cannabis addiction develops when smoking joints stops being occasional and becomes a need: you use almost every day, find it hard to go without and carry on even though it affects your studies, work, mood or relationships. Many people believe that “weed isn’t addictive”, but cannabis can lead to dependence, and quitting is possible with a plan and, if needed, professional help.
What cannabis addiction is
Cannabis comes from the Cannabis sativa plant, and most of its effects are due to THC (tetrahydrocannabinol), a substance that acts on the brain and alters perception, mood and memory. It is mainly used as marijuana (the dried plant) or hashish (the resin), usually smoked and mixed with tobacco, although it is also eaten in food or vaped.
No other illegal drug has as many users in Spain, and at the same time it is one of those seen as least dangerous, especially among teenagers and young people. That low perception of risk means many people are slow to realise they have lost control. With frequent use the body gets used to it (tolerance), you need more to feel the same and you feel unwell when you stop.
There is no single profile. There are young people who start smoking in a group, as a way to fit in or have fun, and adults with stable lives who smoke every night “to switch off” or to sleep and, over time, feel they can no longer do without it.
Effects of cannabis
Short-term effects
- Relaxation, laughing easily and a sense of well-being.
- Red eyes, dry mouth, increased appetite and a racing heart.
- Drowsiness, slower reflexes and poorer coordination, which makes driving dangerous.
- Distorted sense of time and of the senses, difficulty concentrating and remembering.
- In some people, anxiety, paranoia or panic attacks, especially with very strong varieties or at high doses.
Risks of continued use
- Problems with memory, attention and learning, more marked if use starts in adolescence, when the brain is still maturing.
- Lack of motivation, giving up hobbies and poorer performance at school or work.
- More anxiety and low mood in the medium term, even if at first it is used to calm down.
- Risk of psychotic episodes in vulnerable people, which require urgent psychiatric care.
- Respiratory damage, especially when smoked with tobacco.
Signs that smoking weed is becoming a problem
- You smoke every day or almost every day, and earlier and earlier in the day.
- You find it hard to sleep, eat or relax if you have not smoked.
- You have set out to cut down and not managed it.
- You spend a lot of time and money getting hold of it.
- You have given up activities or friendships that used to matter to you.
- You keep smoking even though you notice it affects your memory, your mood or your responsibilities.
Signs a family may notice in a teenager
A sudden drop in grades, skipping school, a change of friends, shutting themselves away in their room, irritability, apathy, frequent requests for money or a smell of weed on their clothes. No single sign confirms problematic use, but if several come together it is worth talking about it calmly and seeking guidance. We have an adolescent programme that also works with families.
Cannabis withdrawal syndrome
When someone who smokes frequently stops, withdrawal syndrome is common. Its most usual symptoms are:
- Irritability, nervousness and anxiety.
- Insomnia and very vivid or intense dreams.
- Loss of appetite and, sometimes, an upset stomach.
- Restlessness, difficulty concentrating and low mood.
- Intense urges to smoke (craving).
It usually starts in the first few days after stopping and gradually eases over the following weeks. It is not usually physically dangerous, but it is uncomfortable enough that many people go back to smoking just to make it go away. Knowing that it will pass and having strategies for those days makes all the difference.
How to quit weed: practical steps
- Be clear about your reasons. Write down what you would gain by stopping: better sleep, saving money, getting your memory back, being more present with the people you love.
- Choose a date. A quiet week is better than exam season or a very stressful time.
- Remove what makes using easy. Get rid of your gear, delete dealers’ contacts and, at first, avoid the plans where there was always smoking.
- Identify your triggers. Boredom, anxiety, certain people or bedtime. Prepare an alternative for each one.
- Look after your sleep. Regular hours, exercise during the day and no screens before bed help you get through the first nights.
- Bear tobacco in mind. If you mix it, you will also crave nicotine; discuss with a professional how to tackle both.
- Tell someone you trust. Feeling supported reduces relapse.
- If you slip up, do not give up on everything. A slip tells you which situation caught you off guard; it is not proof that you cannot do it.
If you smoked to calm anxiety or to sleep, it is important to also treat what lay underneath. When substance use exists alongside a mental health condition, we speak of dual diagnosis, which needs a combined approach. Many people succeed with outpatient treatment, without giving up their routine.
When to ask for help
Ask for help if you have tried to stop several times without success, if the discomfort when you stop is too much for you, if cannabis is affecting your studies, your work or your mental health, or if you start having strange thoughts, intense mistrust or a feeling of being followed. In the event of a psychotic episode or a serious crisis, go to A&E or call 112, the European emergency number.
If you are a mother, father or partner and do not know where to start, we can also advise you. At Fundación Salud y Comunidad (FSC) we offer a free first appointment in Barcelona; you can call us on +34 93 424 04 00.
Frequently asked questions
Is cannabis addictive?
Yes. Although not everyone who tries it becomes dependent, frequent use leads to tolerance, withdrawal symptoms when stopping and difficulty controlling use. The risk is greater the earlier use starts and the stronger the product.
How long does cannabis withdrawal last?
Symptoms usually appear in the first few days without smoking and decrease over the following weeks. Sleep problems and the urge to smoke can last a little longer, which is why it is a good idea to prepare for that period.
Is it better to quit weed all at once or gradually?
Both options can work. Some people prefer to set a day and stop; others first cut down the amount and how often they use. What matters is having a specific plan and, if previous attempts have not worked, getting professional support.
Can cannabis cause psychosis?
In vulnerable people, especially if they start in adolescence or use high-THC varieties, it can trigger psychotic episodes. If hallucinations, feelings of persecution or very strange behaviour appear, seek medical attention as soon as possible.
What should I do if my child smokes weed?
Avoid reacting in the heat of the moment and find a calm time to talk, showing interest in what using gives them. Set clear, consistent rules and, if use is frequent or you see major changes in their behaviour, seek professional guidance.