I have toked for 40 years and 2 weeks after getting my VB, my lungs were clear! Put a little sticker on the knob, so you can get an idea where the right temperature is. Try at about 11:00. If the weed burns, it will taste horrible! The vapor is lighter than smoke and your herb should still look greenish. The screens are a bit tricky, and you can clean the glass to look like new with vodka. You will be able to see the vapor in the glass tube. The left over weed can be used in brownies. The high is a bit different ( no combustion products), but you will have no doubt that you are high. By the end of 2 weeks, you will be wondering why you waited so long to get your VB. :thumbsup: I haven't done other herbs in my vaporizer.