Thanks for the responses guys! since colorockman told me that burning a candle releases CO2 I have left a candle in the room (very small about 6x2x7) during the light schedule and when I am there.

mordok, I saw that in the I Grow Chronic video also, that is why I was so curious.. It seems very legit, just unsure about the buds and the leaves, Ive been told it may be able to cause mold.