A writer in The Huffington Post did an actual field test regarding the use of vodka in tampons. In a nutshell, he used herself as a subject. The effects may be overrated in terms of actually causing people to get high. In fact, using a tampon results in a lot of spillage and wet undies or flooring when it's inserted. However, the intrepid writer who tried it out under three different conditions indicated that it burned considerably when taken in that fashion.
For me? No thanks.