Your plant will always be able to use co2 people .it might not double but it will make your plant grow faster and stronger. Go back to science class and ask you 4th grade teacher tghat, and she will tell you about trees and photosynthesis.
Man thats some crazy shit.... I am new to this myself smoked for years never thought about growing .to much water maybe try letting them thirst for an extra time period since it is a weed it wont die that easy.
First things first its ok that you smoke and there is notjing wrong with that.What the problem is,you are endangering the well being of your parents household.oh. you need more light the window wont work because at this time of year the sun loses intinsity..less lumans