This info-video provides proof that cotton swabs, "flushable" kitty litter, dental floss, facial tissue, "flushable" wipes, feminine products, etc., cause major damage when flushed down toilets.
This video proves that the only appropriate "flushables" are human waste and toilet paper which is designed to break down (not paper towels and not facial tissue). Not only can disposing of inappropriate items clog and possibly back up City sanitary sewer pipes, they can also clog much smaller private pipes. Regardless, you do not want to be on the receiving end of a clogged sewer pipe.
Keep in mind that it is a lot easier to prevent a clog (by flushing only septic-appropriate items) than it is to clean up after a clog!