so when u mean FANS do you mean the fan leaves or the fan that puts out air???? the fan that puts out air helps strengthen the stem of the plant. and the fan leaves...those are there to catch rays from the lights and collect the co2 in the air and also for flowering plants the plant takes all the elements out of the fan leaves like the nitrogen etc etc and puts it into the buds. you cant smoke the fan leaves, that wont do anything for ya.