Marijuana is a drug; it is green, brown or gray mixture of dried stems, seeds flowers of the hemp plant. Marijuana abuse has impact on body as well as brain.
Naturally a chemical is produced by the body that is very similar to THC; these chemicals are called as endogenous cannabinoids or endocannabinod. THC or delta 9 is one of the ingredient and chemical found in marijuana.
Neurons are cells in brain; information will be processed by this cells. These cells are authorized by neurotransmitter chemicals to communicate with each other. These cells release in to gap between the neurons known as synapse. There are some proteins in neurons called as receptors which are specific to neurotransmitters. Various cellular mechanisms are turned on or off by these receptors. Production, release or re-uptake of various neurotransmitters are effected by the drugs. Actions of neurotransmitters are blocked by the marijuana drug. It interferes with the mechanisms which associates with the receptor. Dopamine is a neurotransmitter, which associates with pleasurable sensations externally. This dopamine production is reduced by drug use. Indication for this harmful behavior of the user. Neurons are activated by this drug leading to high sensation of feelings.
Marijuana users thus experience reduction in pain and increased appetite. They may get sleepiness, impaired attention span, mellow feeling, and blood pressure can be reduced.
There are so many adverse effects of use of marijuana on brain and body of human beings. Some times it may lead to cancer as well as death.