# Evaporate propylene glycol

I tried to make a cannabis infused e-liquid. I made a tincture with marijuana and vegetable glycerin, but it became to thick so a mixed in more propylene glycol than I'd originally planned. Now the e-liquid is to weak, not enough THC per milliliter.

My question is: can I just heat up the e-liquid to 115-123 degrees celsius and let the glycol evaporate over a long time, or is that temperature too low? I don't want to destroy the psychoactive chemicals in the e-liquid.

Best wishes.

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Does $\Delta^9$-tetrahydrocannabinol (THC) significantly degrade when its solution in propylene glycol is heated to 115-123 °C?