The author Andrew Johns, in his journal "Psychiatric Effects of Cannabis", analyzes the dangers of the drug for humans. John's goal is to discover the effects of drugs on users, the rehabilitation process of drug addicts, and the resulting harm caused by addiction. It adopts a resilient tone to encourage determination in the fight against cannabis addiction and use among its readers. Depression, anxiety and psychosis are just some of the adverse effects that can result from what is often considered a relatively harmless drug: marijuana. The British forensic psychiatrist Andrew Johns, in his journal “Psychiatric Effects of Cannabis”, investigates the potential psychological damage that the drug can cause (Johns 2001). He is particularly interested in the effects that heavy or prolonged use can have on vulnerable populations – particularly young people and those with pre-existing psychiatric problems – and what the clinical implications are. Johns approaches the topic with a meta-analysis, relying on the weight of numerous previous studies to prove his theses. His article effectively reveals the potentially harmful and wide-ranging effects of cannabis use, as it correlates with underlying mental illness, addiction and vulnerability. However, due to the exceptionally broad scope of the literature reviewed and the brevity of his research summaries, Johns fails to convincingly demonstrate any of the individual effects addressed. The variation in the scope and scope of the studies summarized, their divergent approaches, and the different populations sampled make it difficult to accept Johns' summary conclusions without further investigation. Johns organizes his article into three main topics: psychological responses to cannabis use, cannabis dependence, and vulnerabilities that may increase the risk factor for one or both of these. Each of the three topics is