removing odors

what is the best product for removing cigarette odors from a small room with poor ventilation?
grab a small ozone-type air cleaner (eBay) and run it all the time… many and most odors are gone without chemicals. I bought one 3 years ago for $25 and it’s still going strong and working well in my home. We used to smoke in the last house and it actually kept up with us. This house is smoke free but 38 years old… highly recommended.