I first time using one was quite a few years ago. I was bow hunting in the hatchie Bottoms and had gotten in the stand a bit early, It was HOT. I remember looking down on my arms and both were covered in mosquitos. I had been used to toughing it out for so many years that I simply forgot about the new thermocell. After a little while I remembered it, pulled it out, lit it and place in on the stand beneath my feet. Simply forgetting about it at that point. It was not long that I looked down at my arms and ...NOTHING! There was not a black fly or mosquito buzzing around my ears and certainly not a single one on my body....I was sold. You young guys are lucky....I remember coming home one day with black fly bites (little red dots)all over my neck and arms and having to go to a company dinner with my wife that night.....She was great about it, but I felt bad. I looked like I had the measles...lol. I can not tell you how many days I spent getting eaten up .....you guys are indeed lucky to have never had to go through that..lol.