A wearable device includes a housing, a biometric information obtainer that is provided on one surface of the housing and obtains biometric information of a user, a functional material cartridge that is accommodated in the housing and stores a functional material, a mouthpiece connected to the functional material cartridge and configured to discharge the functional material, and a controller that provides a recommendation on inhalation of a functional material based on the biometric information obtained by the biometric information obtainer.