I've been using the Refresh version of them [ame=http://www.amazon.com/Refresh-Your-Vent-Sticks-Scent/dp/B0023UPMKI/ref=sr_1_1?ie=UTF8&qid=1364406887&sr=8-1&keywords=refresh+vent+sticks]Refresh Your Car Vent Sticks -New Car Scent : Amazon.com : Automotive[/ame] for awhile now in a couple of my vehicles. They have some great scent choices. The scent is strong for the first week or so then you don't really smell it much until you turn on the A/C or heat, then you get great circulation of the scent. This works especially well with the heat so they are perfect for colder months and climates.