I saw these at my local drug store and saw that they were on sale for $2 - $4 so thought I would give them a try. I was having people over to my house and wanted the place to smell really nice so I put a cone in the bathroom, one in the kitchen and one in the living room. I also put some pearls by the front door so you would get a nice smell as soon as you walked in. In the bathroom I had a warm sent I can't remember the exact one but it had Vanilla in it and the rest of the house had lavender which is my favourite. I had the cones just slightly open and couldn't smell a thing after an hour so I opened them all up all the way and a few hours later still couldn't smell anything. I thought it was maybe because I had been inside and was used to it but I asked a number of my guests and they couldn't smell anything either. You had to go right up to it and put your face a few inches away to smell anything. Not even worth the sale price.