This book provides a comprehensive and up-to-date review of epidemiological and experimental (chamber) studies relating tobacco smoke (ETS) exposure to the induction and exacerbation of asthma in children and adults. Particular attention is given to separating out the roles of maternal smoking in pregnancy and post-natal ETS exposure on the induction of asthma. It is at a level equivalent to that in peer-reviewed academic publications. Previous reviews by the California EPA and by Strachan and Cook reach different views as to whether ETS exposure induces asthma or not. The book is aimed at clarifying the situation by more detailed and more up-to-date investigations.