Hello C S,
Thank you for your recent purchase and feedback.
Using advanced filtration technologies and the highest quality components, our air purifier is very effective in targeting cigarette smoking and a lot of our customers use it for indoor smoking.
However, based on the volume of smoke, filters can get dirtier much faster than used in a non-smoking environment.
Make sure the unit you have is optimum for the room area you use it. We recommend cleaning your filters frequently (at least once a month) and running the unit on the highest fan speed 24/7.
Essentially, the kit comes only with 4 filters since Pre-Filter is permanent and also washable, but if necessary you can always purchase a pre-filter separately when you purchase a new kit.
We hope we have been able to answer your concern and please, let us know if we can be of further assistance.
Thank you for your continued support and for choosing our products.