Alcohol is the world's most widely used recreational drug, and addiction expert John Marsden turns his research on himself as much as anyone else, since he drinks it too. He asks why so many people exceed recommended limits without noticing, and traces the answer into genetics, brain scans, and behavior tests that can flag which healthy 14-year-olds are more likely to develop problems later. A primate lab shows monkeys given access to alcohol forming drinking patterns that mirror human ones, evidence that some of the pull is biological rather than purely social. Marsden also visits scientists developing a designer compound meant to copy alcohol's pleasant effects, the relaxation and sociability, while stripping out the toxicity and addictive risk. The film moves between neuroscience lab and personal reflection, treating Marsden's own habits as data rather than confession. It ends on the open question the research raises: whether a synthetic substitute could ever replace a drug this embedded in ordinary life, and whether anyone would actually choose it.