Marijuana Doesn’t Seem to Have a Long-Term Effect on Memory and Concentration. The short-term effects of marijuana are generally felt within a few minutes, peak within 30 minutes, and wear off after about two or three hours.
http://lifehacker.com/what-marijuana-actually-does-to-your-brain-and-body-1693986467
How Marijuana Works. 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.
http://science.howstuffworks.com/marijuana2.htm
Marijuana is most commonly smoked, but it can be used in vaporizers, turned into a tea, or used as an ingredient in foods as an edible. Oils and tinctures are often made from the cannabis plant as well for medicinal purposes. Of the many ways to use marijuana, smoking seems to have the most harmful side effects.
http://lifehacker.com/what-marijuana-actually-does-to-your-brain-and-body-1693986467
The Brain & the Actions of Cocaine, Opiates, and Marijuana. The first in a 5-part series, offers an understanding of the brain, how the reward center works, and what happens in the brain when a person uses cocaine, opiates (heroine), or marijuana.
https://teens.drugabuse.gov/drug-facts/marijuana
THC, or Tetrahydrocannabinol, is the chemical responsible for most of marijuana’s effects, including the euphoric high. THC resembles another cannabinoid naturally produced in our brains, anandamide, which regulates our mood, sleep, memory, and appetite.
http://lifehacker.com/what-marijuana-actually-does-to-your-brain-and-body-1693986467
Smoking resins of THC from the marijuana plant is on the rise. There are several forms of the extracts, such as hash oil or honey oil, wax, and shatter. These resins have 3 to 5 times more THC than the plant itself.
https://teens.drugabuse.gov/drug-facts/marijuana
While these and other effects seem harmless, they can take a toll on the body. Increased heart rate. When someone uses marijuana, heart rate—normally 70 to 80 beats per minute—may increase by 20 to 50 beats per minute or, in some cases, even double. This effect can be greater if other drugs are taken with marijuana.
https://teens.drugabuse.gov/drug-facts/marijuana
By and large, marijuana has been shown to be much less dangerous and addictive than other substances—over 100 times safer than alcohol—but that’s not to say it is completely harmless. How marijuana is consumed and prepared can make a big difference on its health effects, for better or worse, as well.
http://lifehacker.com/what-marijuana-actually-does-to-your-brain-and-body-1693986467
What Marijuana Does to Our Brains in the First Couple of Hours. The video above from ASAP Science explains how marijuana acts on our brains shortly after smoking or ingesting it. Cannabis contains at least 60 types of cannabinoids, chemical compounds that act on receptors throughout our brain.
http://lifehacker.com/what-marijuana-actually-does-to-your-brain-and-body-1693986467
You can also eat marijuana. In this case, the marijuana enters the stomach, and the blood absorbs it there. The blood then carries it to the liver and the rest of the body. The stomach absorbs THC more slowly than the lungs. When users eat marijuana, the levels of THC in the body are lower, but the effects last longer.
http://science.howstuffworks.com/marijuana2.htm
how does marijuana enter the body
The marijuana enters the stomach, and the blood absorbs it there, the blood then carries it to the liver and the rest of the body and the stomach absorbs Tetrahydrocannabinol more slowly than the lungs. The marijuana enters the stomach, and the blood absorbs it there. The blood then carries it to the liver and the rest of the body.