Can asthma be a genetic disease ?

Its complicated: Asthma can be and does have a genetic component. The genetics of asthma are very complex and involves multiple genes.

Yes: Depending on which study is read, if one parent has asthma, there is a 25-40% chance that the children will have some form of it; if both parents have asthma, then there is a 60-80% chance that the children will have it. This suggests that there is a very strong genetic component to asthma but it is not the only factor.