Here in the U.S. we’ve just celebrated the Fourth of July, with its parades, fireworks, and, of course, cook-outs. If you’re like me, the smell of a grilling burger can make you salivate from across the yard. I feel like Pavlov’s dog whenever it happens, and that includes the seven or so years I was a vegetarian. I’d like to say I react this way only on these idyllic occasions summer holidays, family barbecues, campfire weenie roasts under a star-filled sky. But the truth is I can be walking to my car in July across a 95-degree asphalt parking and smell the exhaust fan from a Burger King a block away: suddenly I need one of those flame-broiled burgers. Every time this happens I ask myself, “Why? Why is this smell such a trigger?”

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