A system for assembling and filling two groups of electronic cigarettes, includes first and second working stations for assembly/inspection operations on a first group of electronic cigarettes and disposed upstream and downstream of a first conveying path, respectively. Third and fourth working stations perform assembly/inspection operations on a second group of electronic cigarettes and are disposed upstream and downstream of a second conveying path, respectively. A single filling station receives the first group at a first loading zone and the second group at a second loading zone to fill the first group and the second group with a filling product; and releases the first group of filled electronic cigarettes at a first unloading zone and the second group of filled electronic cigarettes at a second unloading zone towards the second working station and towards the fourth working station, respectively.