The first subject was enrolled in Dr. Donald Abrams’ FDA-approved study comparing subjective effects, cannabinoid blood levels and carbon monoxide levels in subjects who smoke marijuana or inhale the vapors of the same amount of marijuana generated by a vaporizer. The study requires subjects to live on an in-patient ward for 6 days, with each day involving either smoking marijuana or using the vaporizer. The research involves the use of 3 different marijuana cigarettes, one with 1.7 % THC, one with 3.5% THC and one with 7% THC. The cigarettes are cut in half and used in a randomized, double-blind manner, with half of each cigarette being smoked and the other half unrolled and the marijuana placed in the vaporizer.