There are many well known negative effects of smoking.  Now, researches has found a possible link to food sensitivity.

Aim

To evaluate whether smoking by the mother during pregnancy and infant secondhand tobacco smoke exposure contribute to allergic sensitization in children up to age 16 years.

Results/Conclusion

The study found that exposure to second hand tobacco smoke in infancy without correlated with an increased risk of food allergy and eczema.

In this study second hand smoking exposure in infancy seems to increase the risk to food allergies and eczema in certain age groups.

Reference