Pump the draw or smooth call

[Nashr8521]

CO here has been really TAG. I know the call pre-flop was really really iffy but my real question is with a nut flush draw like this on the flop should I be raise/reraising knowing I have a great draw or should I be smooth calling trying to induce others to stay in the pot knowing I'm drawing to nuts.

Party Poker 2/4 Hold'em (9 handed) converter

Preflop: Hero is SB with K[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, MP1 calls, MP2 calls, <font color="#666666">1 fold</font>, <font color="#CC3333">CO raises</font>, <font color="#666666">1 fold</font>, Hero calls, BB calls, UTG calls, MP1 calls, MP2 calls.

Flop: (12 SB) 4[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(6 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls, UTG calls, MP1 folds, MP2 calls, <font color="#CC3333">CO raises</font>, <font color="#CC3333">Hero 3-bets</font>, BB folds, UTG folds, MP2 folds, CO calls.

Turn: (10.50 BB) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, CO calls.

River: (12.50 BB) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, CO calls.

Final Pot: 14.50 BB