There is only one certainty about drugs – if you don’t use them, you won’t get addicted. Everything else we know about how and why people develop problems with drugs remains uncertain or at least up for debate.
Forty years ago, the gateway theory of drugs emerged and is still widely quoted today. This hypothesis proposes there are a series of stages to drug use that start with legal “soft” drugs, such as alcohol and tobacco, which then lead on to the use of an illicit drug, typically cannabis.
Many people experiment with drugs such as tobacco, alcohol and cannabis during their adolescent years. For some, buying cannabis from a dealer who supplies other drugs can be an access point that might lead them on to using other drugs, such as heroin. In that sense, cannabis use could be a viewed as a gateway to other drugs.
But the gateway theory starts to look flimsy when you consider the fact that not everyone who uses cannabis goes on to use heroin.
The prescription gateway
Although not new, an often overlooked gateway or route into illegal use of drugs is the one instigated by prescription medicine. For example, opiates are prescribed to manage pain. After being introduced to opiates in this way by their doctor, many people go on consuming opiates after their initial pain has subsided. But instead of accessing opiates via their prescriber they enter a shadow world of diverted opiate medication, often made available through family or friendship networks. So while initially opiate use is legitimate, it can act as the first step towards to securing and using drugs illegally and possibly could be a gateway again to other drugs.
In America, for example, the sharp increase in drug overdose deaths has focused attention on the number of people misusing prescribed opiates. Irrespective of how it is sourced, the number of Americans consuming opiates is reaching epidemic levels. How we prescribe these drugs needs further investigation.
Nature via nurture
But there are also other explanations of how problematic drug use can develop. Teenagers who combine legal and illegal drugs are at greater risk of developing problems, for example. Additionally, a blend of nature and nurture leads these people to use multiple drugs. If the critical ingredients of environment, genes and the number of drugs that you start using merge, this can increase the risk of problematic substance use.
So it is not simply a specific drug that acts as a gateway to other drugs; individual vulnerability is the key factor. Several elements can produce this vulnerability. Poverty, trauma and mental health problems can all increase the risk of problematic drug use. But the single biggest factor that impacts the greatest number of people is drug policy itself.
Policy as a gateway
The government’s main responsibility is to protect the population it serves. The current UK administration believes it achieves this by restricting the supply of drugs, with an increasing tendency to ratchet up drug control. In April, for example, the UK will ban all psychoactive drugs apart from caffeine, nicotine and alcohol.
For many, this approach to policy has proved to be an effective gateway into a career of crime, with an increasing number of – particularly young – people introduced to the criminal justice system for minor drug possession offences. The sanctions applied restrict their employment opportunities, alienate them and reduce their ability to achieve their potential. Consequently, many sink deeper into crime, turn to drugs – or both. Rather than protect people, this policy approach has created unnecessary harm.
The new policy on drugs is a refresh of the old one according to the Home Office. More of the same is not good enough. We need a more radical approach that takes a more rounded view of the harms that drugs can cause. Matched by a policy response that is more sophisticated than the current blunt and ineffective legislation. A useful example of an alternative approach is provided by The Liberal Democrats. They convened a group of experts to examine how cannabis could be regulated in the UK.
In some countries, such as the US, more people die as a result of drug use than in road traffic accidents. If these thousands of drug deaths were viewed as car crash fatalities we would support investment in preventative measures, but not all deaths are equal.
So while we can carry on debating causality theories in academia, it is nothing more than a distraction from the tragedy that is unfolding day-to-day for those who use drugs. When it comes to drug policy, the state is not protecting the people it serves. Current policy fails every part of society. It’s time for the government to act ahead of popular opinion and introduce evidence-informed drug policy. A great many lives depend on it.
Ian Hamilton does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond the academic appointment above.
Ian Hamilton, Lecturer in Mental Health, University of York
This article was originally published on The Conversation. Read the original article.



Justice Jackson Slams Supreme Court's Growing Use of Shadow Docket
Organon Stock Surges After Reports of $13 Billion Buyout Bid by Sun Pharma
Comey Faces Charges Over Instagram Post as Free Speech Debate Intensifies
FDA Biologics Chief Vinay Prasad to Leave Agency in April Amid Policy Disputes
Judge Rules Use of Military Lawyers in Civilian Prosecutions Is Lawful
Sam Altman Moves to Dismiss Punitive Damages in Sister's Sexual Abuse Lawsuit
Eli Lilly and Insilico Medicine Forge $2.75 Billion AI-Driven Drug Discovery Deal
Supreme Court Asked to Reinstate Mail-Order Access to Abortion Pill Mifepristone
CDC Acting Director Urges Measles Vaccination as U.S. Cases Surge in 2026
Argentina Court Upholds Cristina Kirchner Asset Seizure in Corruption Case
Novartis’ Vanrafia Shows Strong Phase 3 Results in IgA Nephropathy, Paving Way for Full Approval
Hantavirus Cruise Ship Outbreak Triggers Global Health Alert
Novo Nordisk Raises 2026 Outlook on Strong Wegovy Demand
U.S. Army Soldier Charged in $400K Insider Betting Scheme on Maduro Capture 



