Bad habit - Wikipedia
https://en.wikipedia.org/wiki/Bad_habitResearch on habit formation generally suggests an individual can acquire a new habit on average over 66 days. This process is marked by an asymptomatic increase of the behavior, with the initial acceleration slowing to a plateau after the said time period. There are several variations regarding the period of development. The time to break a bad habit or change an unhealthy behavioral pattern such as smoking may take longer.