AURORA, CO - JUNE 19: John Kofel uses an eye dropper to take small amounts of THC oil as part of a daily regime of THC and CBD oils at his home on June 19, 2017 in Aurora, Colorado. Kofel has prostate cancer and uses CBD and THC oils daily, morning and evening, to help fight the disease. He also has a ton of supplements he takes daily to fight cancer as well. (Photo by Helen H. Richardson/The Denver Post)