The company said the online vendors illegally use Marlboro and other trademarks in domain names and on their sites. The suits also allege the vendors illegally sell imported cigarettes.
The eight defendants include the owners and operators of Web sites such as discount-marlboro-cigarettes.com and dfshop.org.
Sean Moriarty, co-owner of dfshop.org, said he was not aware of the lawsuit and declined to comment. Discount-marlboro-cigarettes.com did not reply by deadline.