well it turns up the heat on it ... ive noticed on some vapes especially the disposable ones ... if they arent hot enough then u get the oil leaking and plugging up the stem and it will start like getting on your lips and in your mouth ... so some of the vapes like the yocan variable voltage like the one i got u can adjust the voltage so that if u do get a mixture thats either too thick or thin u can adjust so it burns it just right if that makes sense