There is a special place inside your brain called the hypothalamus. It is the part that forms habits and more or less stores info in the long-term memory.
Once it gets used of something (habit) it can hardly let go. It doesn't like change at all. It is estimated that it needs more or less 40 days to change any habit and it takes a lot of will to do so.
This reminds of something my high school teacher used to say. Habit is very difficult to change because....
When you remove the 'H'.... abit is still left. When you remove the 'A', bit is still left. When you remove the 'B', it is still left. So darn true!
lol. that sounds way too forced. almost like numerology.
baaad teacher :)
lol. hahah!
Still made his point though. :)