Medicine: Filtered for Safety

When heavy cigarette smoking was first indicted as the major cause of the radical increase in lung cancer, scarcely more than 1% of cigarettes had filter tips. Today at least 40% have them, and tobacco experts expect the figure soon to hit 75%. But do the filters help? Up to now. the cynical answer has been that they help to sell cigarettes, and nothing more. Last week a congressional committee* opened an investigation of cigarette filters, for which the public pays a premium of $500,000 a day. Weight of the evidence: there is hope in improved filters.

Men who smoke less than...

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