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Dude I smoke too but not around any of my plants. They have pores that will take in not only the carbon dioxide but all the other gases u emit when u exhale that smoke. Covers those little guys in tar and whatnot....Just a thought.
Putting that aside there are other ways of getting Co2 to your plants. For one try talking to your plants whenever you are around them. If you sleep around that room you are giving it Co2. Try getting some dry ice, get a 2 liter bottle and cut the top off, drop a few "SMALL" chunks and let them boil down. Beings your plants are very young still the amount Co2 they are taking in is relatively small in comparison to what they need lets say in the fourth week of flower.
Now as for your soil why don't you try to pick up some fox farms happy frog or ocean forest when you transplant. You can get it online or from a hydroponics shop close to you. I personally used the Fox Farms Ocean Forest from seed to finish on my first grow which turned out great. Didn't have much of a PH problem all the way through as long as I ph'd my water before watering with PH UP & Down. U can find that product in most garden hydroponic stores or online for around $15(must have dude)
As you can see in the pics that was my first grow, it was superskunk from nirvana. Fox Farm Ocean Forest, PH UP and DOWN, Organic blackstrap molasses, and four CFL's grew that. Get some good air flow and a great ph, and you can get some nug man.