When the coffee shop I work at first switched owners we only had paper cups. Because of high demand, they eventually brought in an assortment of ceramic mugs. Once the customers could enjoy their latte for 'here', I noticed that we went from having to change the garbage sometimes twice a day to sometimes not even having to change them at all! Not only are real mugs nicer to drink from but they noticeably reduce garbage. We even encourage our customers to bring in their own mug by offering them a 5% discount if they do.