The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
Smoking sucks. Wed prefer you save your breath for this addictive (iPhone) game instead. So next time you feel like lighting one up, light it up in the game of your choice,and scoreyour way to the next level. Try it, its free unlike cigarettes.