Cannabis-induced psychosis is becoming increasingly common across the UK. With stronger strains easily available and a perception that weed is harmless, doctors are seeing worrying consequences for mental health.What Exactly Is Psychosis?Psychosis is not just a medical term; it describes a mental state where someone loses touch with reality. A person in a psychotic episode may hear voices, see things that are not there, or believe unusual ideas with unshakeable certainty. Everyday surroundings feel warped, thoughts become jumbled, and behaviour can change dramatically. These episodes can last days, weeks, or longer, and while many people recover, some continue to experience symptoms for years.Psychosis is not a condition in itself but a symptom of underlying mental illnesses such as schizophrenia, bipolar disorder, or drug-induced disorders. And cannabis, once dismissed as a “soft” recreational drug, is increasingly proving to be a serious trigger.Cannabis and Its Dark SideThe UK has no shortage of cannabis users. In the year to March 2024, about 2.3 million people reportedly admitted to using the drug. But while regular use has halved over the past two decades, psychiatrists are alarmed by a sharp rise in cannabis-induced psychosis cases. The problem is potent modern strains and the growing popularity of “skunk”.Skunk is produced from unpollinated cannabis plants with naturally higher levels of THC, the psychoactive compound responsible for the drug’s “high”. Unlike traditional varieties, these turbocharged versions can push the brain into paranoia, hallucinations, and even long-term mental health conditions.The Risk Behind the SmokeAccording to reports, the public health problem is deepening. There has been a visible rise in the number of people needing intensive support for psychosis as a result of cannabis use. What begins with smoking a few ‘joints’ and feeling a bit paranoid can easily escalate.The issue is compounded by the fact that cannabis is readily available online. High-strength weed can be bought and delivered with the same ease as ordering a takeaway. For some users, that ease leads them into dangerous territory. Over time, repeated exposure to potent cannabis does not just spark temporary paranoia; it can cement itself into a chronic psychotic state.How Cannabis-Induced Psychosis FeelsFor those caught in its grip, cannabis-induced psychosis can be terrifying. Hallucinations distort familiar environments, creating confusion and fear. Dissociation leaves people feeling detached from their own bodies or surroundings. Everyday interactions can feel hostile or threatening, and the person’s sense of what is real becomes fragile.While these symptoms may fade once the drug wears off, for some they linger, leading to severe depression or even suicidal thoughts. Studies suggest cannabis can also trigger schizophrenia in vulnerable individuals, an illness characterised by recurring psychotic episodes, delusions, and long-term disability.Why Skunk Is DifferentYou might wonder, why is today’s cannabis so much more risky? The answer lies in THC levels. Traditional cannabis varieties contained lower amounts of this psychoactive compound, and many also carried cannabidiol (CBD), a chemical thought to counteract some of THC’s mind-altering effects. Skunk, however, has been bred to maximise THC and reduce CBD.This results in a product that is stronger, more destabilising, and far more likely to provoke psychosis. While occasional users may brush it off as a “bad trip”, for others, the effects can be life-altering.A Growing Health CrisisDespite the popular image of cannabis as a “chill” substance, psychiatrists are dealing with an entirely different reality. Hospitals and rehab centres across the UK are seeing more young people admitted with psychosis linked to cannabis. Over time, people can reach a psychotic state which would not go away, even if they stop smoking. They can become very depressed or suicidal.The public health implications are significant. Not only do psychotic disorders put immense strain on the NHS, but they also derail lives, disrupting work, education, and relationships.Rethinking “Harmless” WeedThe narrative around cannabis has long been tangled. To some, it is a natural plant, a stress reliever, even a medicine. But the reality is more complicated. Yes, cannabis contains compounds with therapeutic potential, but when engineered for potency and consumed regularly, it can become a gateway to enduring mental illness.People need to know that today’s cannabis is not the same mellow joint their parents smoked in the 1970s. It is stronger, riskier, and capable of tipping vulnerable minds into frightening psychological territory.