Golden holocaust deniers

It is, perhaps, ironic that "Smoke and mirrors" (16 August) draws a comparison between the horrors of the Nazi era and the numbers killed by smoking in the 20th century: research in Germany in the 1920s and 1930s identified the link between lung cancer and cigarettes, and led to perhaps the earliest anti-smoking efforts (smoking bans, advertising restrictions and higher taxes).

Peter B. Baker, London