Is it worth using co2 on starter plants after the seedling stage is over?

I am getting ready to start tomato plants. I was wondering what the nursurys did to make their tomato plants stalks so and stout.I was guessing co2. If so, what other plants would substantially benefit from using co2.I have access to a co2 controller that constantly keeps co2 @1500ppm,along with the other atmospheric controllers.I have been having fun with this and am looking forward to getting my plants a head start.