what i know about co2 is that apparently it speeds up plant metabolism so you get faster
growth with enough light, and the hotter it gets in your grow room the more co2 your plants
will utilize.
as well, don't forget co2 is for photosynthesis not respiration so co2 for leaves and o2 for
roots only
i guess to answer your question it might speed up the process since co2 is combined with h2o
to form sugar which is what the plant uses to grow so more food equals faster growth
kinda like a fat kid on cake addiction (that's cake, not coke)