either you can hit the pot and win without showdown or somebody slowrolls you and then you crash with the truth, must be careful when do it because the way people play JJ sometimes is taking risks according to the hand but if you are bluffing you can lose your stack if somebody has a strong hand
for instance, imagine you raise 3x and somebody 3bets you, what are you going to do? 4bet? shove? what if the opponent feels confident enough with his hand? what is your response? let`s say he just flat your bet, and then what? c-bet? then if he keeps calling you, you are going to lose more chips than the ones you were winning with a real JJ, so unless you are very skilled guy, named ivey or negreanu, suggest not to
bluff that way,