Bluffing is an importan tool of poker , which must be used in order to have some variety in your play style , to gain many chips etc .
People who don't bluff don't manage to get better in the money positions in a tournament . I checked it on myself . I used to play very passively and almost never bluff, so the others bluffed me all the time and were stealing my blinds . So I tried to learn and use (still I have a lot to to learn ) bluff and semi bluff as much as I could from potition , to players I knew as passive and weak , not calling stations and bingo players , I used continuation bet and bets generally to exercise pressure upon my villains abandoning my limping behavior as failed . On heads up I also use it carefully.