Does it heighten the senses? Damn right! Food is unbelievable, we all know that. Obviously things are more interesting to look at. As for the hearing thing, when I listen to music when I'm lit, it sounds amazing, and I always here different sounds that you wouldn't pay attention to when sober. As for touch, one word, sex (with yourself or others lol). And smell, I dunno, sometimes I smoke and can't smell the weed for some reason, but other things smell great. So, anyway, its nice to have something in life that makes everything better.