I have a gas question!

I just recently acquired some CO2 containers, and I was wondering when the best time to supplements my plants would be.

First, is there any benefit to spraying CO2 into the room if they're just in veg? So far, I've only been supplementing my flowering plants.

Second, what time of day can they use the gas most? At night with the lights off? During the day? Early morning? Does it matter?

Anyways, thanks in advance for anyone who can help me out here! I'd really appreciate the knowledge!

best is during light, since they use co2 to perform photosynthesis. i'm not sure about using it for veg.

iam not too sure as still a newb me self but i did read some were that its most benifical during the veg stage as it gives u faster growing in a shorter period of time but not 100% sure why dont u search it on the net some more