Most vaporizers can hold a couple grams of weed in the bowl. It does depend if it is a herbal vaporizer for one. If it is a pen, portable or desktop vaporizers. Since the table top vaporizers are the ones that have the biggest chamber. It is safe to say that those types of vaporizers are the easiest ways of smoking weed. With the dry herbal vaporizers the cartridge with most pen vaporizers run out pretty fast.
At-least the best thing someone can do when you are first starting out with a vaporizer is to actually show the person how to do it. It isn't that hard but there are many people that want to learn how to use a new vaporizer and there are plenty that will show you how to smoke weed out of one.