Smoking behaviour before, during, and after pregnancy: the effect of breastfeeding.

After a decreasing trend, the prevalences of smoking in pregnancy were 11% in Canada in 2005 [ 9 ], 16% in Denmark in 2005 (among pregnant nulliparous women) [ 10 ], and 20% in Australia in 2004 [ 11 ].

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Moreover, an increasing trend has been forecast for Eastern Europe and Asiatic countries [ 2 ].

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