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In 15-20 years mayby less, cannabis will be legal for adults in most of the western world. I am from Denmark, and here the goverment is talking about legalizing it to avoid all the crime attached with marihuana-trade. New polls has shown that 58% of the people wants cannabis to be legalized...

Hello RollItUp! My first post :D I am starting my first hydroponic grow in af few weeks. I was wondering exactly how much i would have to exhaust from the growspace during the night-hours to keep CO2 levels up and humidity down. So i guess my question(s) is: 1. Does plants use any CO2 when...