co2 enrichment

What about filing co2 into my room through my respiration?
Close all the doors and windows in a room and after couple of hours the co2 ppm indoor goes up to upper than 1000ppm i guess.
Grow tent uses ventilation system, but indoor avg co2 level keeps high enough for plants to get advantages from because there is no ventilation outside tent.
Without co2 tank or generator, can i give my plant enough co2 this way?

No, you could try exhale co2 bags for your tent and that could work in your tent. Even if you pay another person to breathe on your plants 24/7 it will never be enough. Depending on your set up as well added Co2 may not even be useful to your grow, if you dont have more light/heat then they can handle on their own they wont require the added Co2 enrichment.

If your room is not sealed, it is totally useless to add CO2. Wether it is with bags, breathing, tanks, generators.
Turning off the exhaust fan to prevent the CO2 getting sucked out, will cause the humidity and temperature to rise.

If you would have a sealed room, then maybe if you would connect your growroom to a classroom full of kids, then maybe it would work.
Go for it!