Asthma cases have risen in line with the number of vehicles on the roads, so you're surely not trying to say that smoking prevents asthma are you?
In a multivariate analysis, children of mothers who smoked at least 15 cigarettes a day tended to have lower odds for suffering from allergic rhino-conjunctivitis, allergic asthma, atopic eczema and food allergy, compared to children of mothers who had never smoked (ORs 0.6-0.7). Children of fathers who had smoked at least 15 cigarettes a day had a similar tendency (ORs 0.7-0.9). http://www.ncbi.nlm.nih.gov/pubmed/11422156
These results suggest that nicotine modulates allergy/asthma primarily by suppressing eosinophil trafficking and suppressing Th2 cytokine/chemokine responses without reducing goblet cell metaplasia or mucous production and may explain the lower risk of allergic diseases in smokers. http://www.jimmunol.org/content/180/11/7655.abstract
Conclusion
Personal and parental smoking is associated with a reduced risk of allergic sensitization in people with a family history of atopy.
http://www.jacionline.org/article/PIIS0091674907019549/abstract
It's not me saying it MrRaW....it's the scientists.
