<prompt> Translate the following text to SwahiliAccording to Upjohn, the leading explanation offered by the quitters is that the drug doesnt restore the sexual desire or the pleasure they once derived from sex.  <response>: Upjohn anasema kuwa sababu ya kuachana na dawa hiyo ni kwamba hairudishi tamaa ya ngono au furaha ambayo walikuwa nayo wakati mmoja. 