Well at least you are sensible about it! For that I thank you lol, truly. I can agree that the smoke is wicked effective from the times it has been used on me, I myself always run invis instead for PvP.
I feel that it's all about the range you use the smoke. Like.. if you're careless and toss it from afar you can miss, but if you're too close you can still take a shotty or fusion to the face. I have managed to kill my attacker through his/her smoke with a good range fusion, got example.
That's a bit specific though lol, I suppose not everyone is running a fusion with almost max stability and range finder.