The sense of smell is much more than the simple detection of the chemical stimuli in the surrounding ambient. In the human brain, areas are activated both in smell and in emotional processing and scientists claimed that the sense of smell is in fact part of a complex emotional system. Smells are communication tools and, at the same time, devices to elicit emotions in humans. Human-Computer Interaction has recently showed a growing interest in exploiting the connection between emotions and the sense of smell. However, a long way still needs to be undertaken to implement smells in HCI. The understanding of physiological and perceptual processes, as well as technology and delivery systems are current challenges in olfactory research. Our ambition in the SCHI Lab is to develop guidelines for creating delivery technologies and for classifying smells, shedding light on crossmodal correspondences and interactions between smell and other senses, directing designers to systematically and fully exploit all the potentials related with the use of smell.