Vaporization and incineration are what happens when lighting a bowl or smoking flowers.
When putting fire to flower, the oil filled Trichome Heads burst and the oils vaporize just before the plant matter begins to burn and blacken.
Dry herb vaporizers heat the plant material to a temperature right in the middle, where it’s just hot enough to break and vaporize the oils but not hot enough to catch the plant on fire. The goal being a cleaner smoking experience from flowers. Precise temperatures are key, so vaporizers with adjustable temperatures will be more useful. Many medical markets do not have the option for concentrated cannabis, so precision dry herb vaping is the preferred method of ingestion.