Suttas which explain how to deal with unwholesome habits Are there any suttas where the Buddha gives advice how to change one's behaviours, like eating addiction,  mindless eating, addiction to entertainment, laziness and all that? Basically giving in into worldy pleasures.

Thanks
Although the Noble Eight-fold Path is the all-encompassing way, one often wants specific advice on "defilements". For example, searching SuttaCentral, we have AN6.58 Defilements describing six factors of dealing with defilements. 


  Mendicants, a mendicant with six factors is worthy of offerings dedicated to the gods, worthy of hospitality, worthy of a teacher’s offering, worthy of veneration with joined palms, and is a supreme field of merit for the world


The question you've asked is actually quite broad. In fact ALL the suttas answer your question. For example, simply consider that identity view is an unwholesome habit. In this case, one would consult MN8 Self-Effacement. As individuals, we each have our own set of unwholesome habits and it would be best to conduct such a search on a Buddhist Sutta site such as SuttaCentral.net according to your own needs.  

Inevitably, one realizes that relishing is the root of suffering (MN1). Sometimes that is enough to let go and deal. Sometimes we need other suttas for more leverage.