Blue crystal

Blue crystal is a "designer drug" that was created by the Smurfs in the EMPATH: The Luckiest Smurf story series. It is so named because it resmebles a blue piece of crystal similar to that of rock candy. It is taken through digestion, and its effects include euphoria, increased energy, and visual and auditory distortions. However, blue crystal has proven to be very addictive as well as detrimental to a Smurf's health, as prolonged usage could result in loss of teeth and very pale mottled skin as well as death.

Blue crystal was first introduced around 150 years after Empath's final return from Psychelia, when the new generation of Smurfs were experimenting with various substances, much against Empath's better judgment.