Co2 and flowering

I am 2 weeks into flowering and I am still using CO2. Will this help or hinder flower production?

It will help dramaticly done in the right doses at (1500 ppm).

Is adding CO2 really needed if you have a well vented area that has constant fresh air???

Not if you're in the grow room a lot, but they really like CO2 so a little extra is never unwelcome.

peace :)