Almonds and cyanide have the same scent, and although they have different chemical bonds therefore giving them both different shapes, they vibrate at the quantum level on the same frequency. The nose listens for the quantum vibration more so than it looks for a certain shape to fit into its lock and key model of recognizing a scent which is why this is important. First a scent fits into the noses receptor which is the lock and key model and then molecular vibrations take over working in unison with the lock and key model to create the actual scent itself