Effect of public smoking ban in Helena, Montana: When results look too good to be true, they probably are

doi:10.1136/bmj.328.7452.1379-b

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Geoffrey Kabat, epidemiologist (gck1@optonline.net)

16 Bon Air Avenue, New Rochelle, NY 10804

EDITOR—As a cancer researcher who has published extensively on the harmful effects of smoking, I am in favor of vigorous smoking bans. However, the study by Sargent et al, claiming that the six month smoking ban in Helena, Montana, was associated with an immediate 40% drop in heart attacks must be viewed with scepticism.1

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