Ok so I am completely new to vaping with adjustable voltage and wattage. I have a j well gecko and it gives a lovely vape for myself. But I am currently using wattage setting 15 and the lady in the shop said to keep it between 15 and 20 watts. I have heard I may experience a nicer vape through the volt setting but have no idea what the parameters would be. Like the highest and lowest to not ruin the coil/battery (assuming that's why the woman in the shop advised I stay between 15 and 20 watts. Thanks in advance ! I'm using. 0.6 coil.