Smells
This one is pretty simple: If you walk buy a bakery, and it smells good, you can’t help but take a look at what they’re selling. Good smells can equal a purchase. This is one of the reasons why fruits and vegetables are placed at the front of a store. Between the smells they produce, and the (generally) bright colors, it’s a solid way to generate some impulse buys as soon as you walk in the door.