Twenty-one days to kick a habit?
That's interesting. Any particular habit?

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Almost any of them. In some cases the habit isn't completely
eradicated, but after being dominated by the conscious mind for 21 days
the subsconscious compulsion is substantially weakened. Many of the
physiological addictions remain, but can be more easily controlled and
or suppressed, throughout the remainder of a lifetime.

Try it. Pick out something new you want to learn or something old you
want to lose. Include the new idea or exclude the old behavior for
21-days. See for yourself. :-)