Superstition is anything which has been told to do else something bad will happen.
The anticipation of bad happening creates fear in us.
And that fear drives our lives in making us do some stupid remedy, changing the path we were originally on and feeling low overall. Belief in superstitions does some little damage right then and there as whatever we do to avoid misfortune costs us some time, an opportunity can be missed and the energy and efforts which got wasted could be utilized for something for positive and constructive.