The New England Journal of Medicine Downloaded from nejm.org at UNIVERSITY OF SYDNEY on May 22, 2013. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org at UNIVERSITY OF SYDNEY on May 22, 2013. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org at UNIVERSITY OF SYDNEY on May 22, 2013. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org at UNIVERSITY OF SYDNEY on May 22, 2013. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

The New England Journal of Medicine Downloaded from nejm.org at UNIVERSITY OF SYDNEY on May 22, 2013. For personal use only. No other uses without permission. Copyright © 1992 Massachusetts Medical Society. All rights reserved.

Genetic influence on smoking--a study of male twins.

The results of twin and family studies suggest that heredity has a small influence on smoking behavior...
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