It sure does! They need CO2 the way we need oxygen, so the more they get, the better. And they're putting off oxygen as a "waste" gas, which of course improves our health. I love being in a grow room.... the air is like nowhere else. I love breathing out on the plants. But what they really like is CO2 pumped into the grow room... ramps up flower growth and helps get those crystally and dense indoor nugs.
Thanks for the question, I was hoping somebody wondered that!