Vaasana need not be poorva janma vaasana alone. They can be referred to the present janma too which is sometimes referred to as dhOsham if it happens to be a negative one. For example 'sahavaasa dhOsham'. In olden days parents used to have a eye on their children as to who he/she is moving with. Even some kind of segregation were rooted in this belief. Modern secularists decry these behaviors but then the secularists are totally against Hinduism in some way or the other and as a concession to you they would want Hindus to follow some form of westernized religion or shall we say 'reinvent' Hinduism! Oops, I am getting into a controversy! I have seen in my own experience that certain individuals losing their lusture in some company while gaining in others. There are individuals who are conscious of themselves sometimes they are even termed as self-centered etc while others lose themselves easily to be carried away (eduppar kaippillai). Vaasana can also be referred to as samskaara or impression. Samskaara is also referred to the ceremonies that happen to an individual in his/her life time such as naamakaraNam etc.