In this issue there is a strong set of papers reporting research findings, but hopefully they contain within them help with Kipling's sixth question, “so what?”—research relevant to making a difference and certainly good enough.

An editorial and linked paper throw light on the methodological problems in validating self reported smoking; something that is becoming more and more important now that governments are investing real resources in helping people to quit.

See 163–4, 167–170 …