The smell cannon

Maybe the scariest marketing technique we've ever seen, Japanese mad scientists have created the "air cannon", a sniper-like scent-device which can literally shoot odor-infused vapors right at the nose of unsuspecting passersby. While originally designed for use in virtual reality, it's only a matter of minutes until this surfaces at your local mall. Unsurprisingly, scheming marketers see genius and big money in the seduction of smell, and will likely have no qualms about shooting potential shoppers with must-buy perfumes or tempting food odors like baking-bread and freshly ground coffee (how about that next time you walk past Starbucks?). The device uses a mounted camera to follow the victim's eyes and sends a blast so accurate that a bystander merely 20 inches away won't smell anything. What exactly is the advantage to being able to target just one person? Wouldn't an odor wafting pleasantly from a store window (which is artificially created all the time) work much better than a shot to the face?
If this thing ever gets out of the prototype stage, it's only a matter of time until someone with allergies gets shot with some perfume and decides to fire back with a lawsuit.