Scentee wants to expand your smartphone horizons and add smell to the senses your phone already stimulates. The plug-in accessory attaches to headphone socket on both iPhones and Android smartphones and, when told to by the companion app, releases a burst of fragrance, paired with a customizable LED light.
In no particular order, aromas include rose, mint, cinnamon roll, bacon, coffee, curry, jasmine, ylang-ylang, lavender, apple, coconut, strawberry and, corn soup.
http://www.engadget.com/2013/10/25/scentee-accessory-smell-android-ios/