Ya, CO2 requires a delivery system, and a sensor to activate it on/off. Plus it requires H.I.D. lighting, higher temperatures, air tight room, correctly installed intake/exhaust system, etc. Simply releasing from a paintball gun thing mah jig most likely is not going to do much, if anything. Even if you are the MahGavah guy who can make an atomic bomb from shoe laces.

Ideally you inject C02 to the 1500 ppm mark, hold for 3 hours, and then totally swap out the air in the room and replace again during lights on.

My growroom is set up for it, but I decided not to phuck with. I am not crazy about a gas grill tank sitting in the house firing a C02 generator for one thing. And I get excellent results without using it.

But, if you insist on trying it, best of luck.

b0nger