What are uses of marijuana resin?

Marijuana resin has only one use: smoke it.

Resin is basically residual THC and plant matter. Contrary to popular belief, resin does get you high. Many believe resin is tar. Although resin has tar like properties, it is not tar. Many also believe resin is more unhealthy to smoke than cannabis, this is also untrue, resin will affect your lungs the same way as Cannabis bud.

An easy way to get resin from your pipes is an ISO alcohol extraction. Do NOT use paper clips, it will permanently stain the inside of the glass from scraping, and bowls and pipes can easily be broken with paper clips. Pour 91% ISO Alcohol down the downtubes/bowls of your pipes. Shake it very roughly until the ISO alcohol is very dark and most of the resin is gone from the sides of the glass piece. Pour the ISO onto a pyrex dish, let it evaporate. After a few hours, you will have dried resin ready to be scraped with a razorblade.

Another efficient method of obtaining resin is from bong water. Take a paper cloth, cheese cloth, or some fine filter, and put it over the joint of the pipe. Pour the water out, and catch the plant material in the water. There should be chunks of unburned bud, and other plant material. The chunks have a lot of THC in them, they are very valuable.