One can not always guess where scent goes. When there are gnats and squitos i sometime like to puff on a corn cob pipe, I do my best to never inhale and I am allergic to bug dope. A few years back I was making a smoke bomb, the bugs were awful. The smoke went low up the slope to the east. Soon after that, far down the slope to my left and into the breeze a deer started snorting and bolted back to where it came. About 5 minutes later, I could see a buck working down that same trail, he got to the bottom and did the same as the deer before. Then looking around in the setting sun and in the ravine that lead to where the deer were, I could see my smoke. My scent went up the higher ground got to the top of that ravine and followed down against the breeze that i was in to where the deer smelled me. if it was not for the gnats, I would have never got the lesson on late afternoon thermals for that spot.