Electronic smoking device and additive reservoir for electronic smoking device

An electronic smoking device comprising:

• an air inhalation port;
• an atomizer/liquid reservoir portion comprising:
• a liquid reservoir, and
• an atomizer adapted to atomize a liquid stored in the liquid reservoir;
• an air duct configured to guide atomized liquid from the atomizer towards the air inhalation port;
• a receiving section located at a back end of the atomizer/liquid reservoir portion;
• and
• an additive reservoir removably attachable to the receiving section, the additive reservoir comprising:
• an additive storage volume,
• a through hole extending through the additive reservoir and being configured to communicate with the air duct to guide atomized liquid to the air inhalation port, and
• an additive outlet opening that opens the additive storage volume to the through hole.