Chevy silverado 1996 V8 5.7L has white smoke?

my silverado V8 5.7L silverado i barely bought i did not notice if it had white smoke but then i added a bottle of fuel additive that i bought at kragen and it was suppose to clean the fuel injectors. then i notice a bunch of white smoke come of the tail pipe. I want to know if the fuel injector additive causes white smoke because im going to smog the truck. I would apprecite your response