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C02 in veg

Hey guys, just wanted to know what everyone thinks of using a c02 generator in veg! i know some people say its a waste, while others say it helps a lot in both veg and flower, so let the discussion begin!!
 
adding some info since i might get questions on this: In a completely sealed room with controlled temp and humidity as well. one of those c02 burners, not one of those things you shake.
 
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