[GanjaG]

I think to much of even a good thing is just still to much. everything in moderation, after a certian point I think they would sufficate, to much stagnant air/humidity and you will invite mold to flourish. people who use co2 still vent and air exchange, proper ventalation lets the plant find what it needs in gas form, plus carbon levels are at a all time high, natural air mixtures I think is enough, but supplementing has benifits, but you do need to know how from someone with more experance or you will probally just kill them. Just my opinion though...