Cyber Physical Systems (CPS) are becoming more ubiquitous, complex and powerful. Inherent benefit and comfort come with an environmental impact that is usually ignored when implementing these systems. This short paper intends to raise awareness of this impact due to the increasing number of connected devices and the data volume produced by their use. We rely on a specific smart home case study to illustrate the potential of considering life-cycle analysis of both the physical devices and data to set up a CPS. Our research in progress targets a design approach to converge into an equilibrium between utility, performance and minor environmental impact of smart systems.