Hello!
I believe that every person that get to read this post also have good and bad habits. Since we're living with various personality, the habits can be formed through how we live our life since the very beginning (started from the family) or could be formed through the environment we grew up.
One of the definition of habit (link) as noun is an acquired behavior pattern regularly followed until it has become almost involuntary. The keywords here are behavior and pattern. Why I said so? Because since everything begin from behavior that has some pattern (in this case : regularly), the habit may be formed. OK, up till this, I should've enough with the explanation.
This post might be unaccepted by some people who have different point of view with me, and I just want to share my point of view of what are good/bad habits of mine. Let's go!