There is also the aspect of habit being genetically wired. If course with practice a habit can be replaced by a stronger one.Mkuu, this article is according to who?, or which research?, am asking this because these things you are putting here influence people and can be very misleading, what I know so far, a habit is a repeated action, and actions are a result of what we think most, and thoughts can be a result of our programing, so, can you tell me, programming and thoughts are caused by blood groups?.