I use a volcano, it’s a vaporizer for flowers, I grind up weed and put it on heat, which traps the vapor into a balloon that’s attached, and just take a hit out of the balloon. It’s the healthiest way (besides oil and edibles) to use the flowers and I can fill up 1-6 balloons (depends on a temperature setting) before reloading the bowl.
After Use, the weed turns brown, kind of similar to the decarboxylate (turning thc acid into actual thc) process, before I use to throw those away but now, I use it to make butter, kind of like milking every bit out of the weed.
But decarb-ing on the oven works better instead of reusing used vaporized weed unless you have the vaporizer that shows you the actual temperature.