It is a ridiculous thing, and fit for a satire to persons of judgment, to see what shifts these formalists have, and what prospectives to make superficies to seem body, that hath depth and bulk. I speak of the north shore of Tahoe, where one can count the scales on a trout at a depth of a hundred and eighty feet.
Marijuana in the Body. Every time someone smokes a marijuana cigarette or ingests marijuana in some other form, THC (delta-9-tetrahydrocannabinol) and other chemicals enter the user's body. The chemicals make their way through the bloodstream to the brain and then to the rest of the body.
THC has been found to be immediately detectable, with blood levels of THC reaching a peak at around 9.0 minutes into smoking. In the referenced study, it took between 3 to 12 hours for THC to drop below detection limits for the low-dose group and from 6 to 27 hours for the high-dose group of the study. However, the subjects of this study were not regular marijuana smokers, which explains why THC levels fell so quickly.