Quote Originally Posted by Joel
Its fine, I always smoke bong bowls n blow it on my plants, the room I grow in is air-tight with the except of a crack under the door, it gets really hotboxxed lol.
The stomata are located on the underside of the leaf and responsible for transpiration and many other life functions of the plant. There are millions of stomata and they must be kept clean to work properly.

Blowing smoke is a big NO-NO on plants.