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Phoenix666 writes:

This fall, the start-up Vapor Communications, for example, will introduce several devices to include subtle scents with books, movies and clothing. And the company will start mass production of its oPhone Duo, a tabletop device that can emit scents based on how an iPhone photo is labeled.

Another company, Scentee, already has a scent product on the market. The product, also called Scentee, is a cartridge that plugs into a smartphone's headphone jack. It can be set up with an app to emit a puff of fragrance when a text message or email arrives.
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All of the products depend on a small pellet called an oChip — the "o" in the product names is for olfactory. In the oPhone, each chip contains from one to four aromas. The chips are sold in packets of eight, grouped into "families" of similar smells, called Coffee, Foodie and Memory. A person who wants to describe the smell of a pasta sauce, for example, could choose notes of tomato, rosemary and parsley, which would then command the player to position those chips so the air would flow over them, combining the scents.

Adding smell to entertainment would make it immersive, but do you really want to experience the odors when our heroes get trapped in the trash compactor on the Death Star?