A system for conveying electronic cigarette components, including: a guide including a stopping station; a carriage to slide along the guide; a retaining device for holding a component of an electronic cigarette; and a locking unit for locking the carriage relative to the guide at the stopping station. The locking unit includes: two abutment elements mounted on the carriage and disposed at a predetermined mutual distance; and an inserting element which is: disposed at the stopping station shaped such that first and second edges contact the abutment elements, respectively, when the carriage is at the stopping station; movable between a retracted position free from the abutment elements to allow the carriage to slide, and an advanced position contacting the abutment elements to prevent the carriage from sliding. Each abutment element is rotatable about its axis to facilitate movement of the inserting element between the two positions.