FYI - Temperature this morning in south Louisiana at 4 am - 71 degrees - foggy, very light NE wind; mosquitoes everywhere[X(]! Took it for as long as I could stand it - I even had a bug suit on and they were biting me through it wherever it was tight. At around 730 am I decided to give the thermocell a try since nothing was moving around. I placed it as close to the tree as possible on the platform of my climber. In about 10 minutes I removed my head net because I noticed that the mosquitoes were not buzzing around me anymore. I did not see any deer this morning (I don' t think they were moving at all), but at least I still have blood left to hunt another day. I was amazed. I didn' t notice any smell, but common sense tells me that anything that is a repellant must give off some form of odor. Only time will tell for sure if deer can detect it - but for now it works wonders when the winds are light and the bugs are hungry!! Any reports on deer detecting this thing?