On 21 November The Spectator is hosting a discussion about addiction — disease or choice? — and how we should best treat it. This neatly coincides with ‘Live like a Stoic’ week (25 November–1 December), which culminates in academics and doctors discussing how far problems of everyday life can be solved by the Stoic practice of thinking rationally about them — in modern parlance ‘cognitive behavioural therapy’ — rather than by expensive medical intervention.