Kneel for the answer, how old is hemp?

Marijuana, commonly known as "hemp". It originated in India and was introduced to other countries. Its scientific name is Mary Warner. South Africans call it "Daga" and Mexicans call it "marijuana". Generally speaking, cannabis that can be made into drugs does not refer to all cannabis, but refers to the shorter and more branched varieties of Indian cannabis. This kind of hemp contains resin-hemp resin in the top of female flower branches, leaves, seeds and stems. Today, the main producing areas are Mexico and Colombia, as well as Jamaica and the United States. In China, the climate south of Tianshan Mountain in Xinjiang is dry and hot, and the hemp produced is also Indian hemp, which is now planted all over the country.

Cannabis resin can extract an oily, water-insoluble liquid called THC, which is composed of tetrahydrocannabinol. The higher its content, the more energetic the drug is; The other is a concentrate of cannabis, called hashish. The preparation method comprises soaking the plant raw materials in a solvent, filtering out the plant contents, and removing the solvent to obtain a resinous colloidal substance which is more toxic than hemp leaves. It is generally believed that cannabis contains about 0.5% ~ 0.6% tetrahydrocannabinol, while Indian cannabis contains as much as 25% ~ 60% tetrahydrocannabinol.

The use of marijuana was initially related to religious activities, followed by treatment. Drug addiction is later. As early as 4,000 years ago in China, there was a description of marijuana in Huangdi Neijing. In the 2nd century AD, Warren, a famous doctor in China, used marijuana as an anesthetic, which was also recorded in Compendium of Materia Medica.

In India, marijuana has long been used as medicine and smoked as marijuana. In the United States, since the first British immigrants came to settle in the United States, there has been Mary Warner. British immigrants used it to weave cloth, which was called marijuana at that time. /kloc-doctors in the 0 th and 9 th centuries planted marijuana in large quantities for its medical function. 1937 After the US Congress passed the law prohibiting Mary Warner, the Food and Drug Administration (FDA) declared Mary Warner useless in medical treatment and withdrew from the medical market. In the next 25 years, Mary Warner was abused mainly in the black residential areas of the city, and the rest of the American public did not use it. In the 1960s, during the Vietnam War, thousands of college students, soldiers, "hippies" and anti-war activists began to smoke marijuana and grow their long hair as a symbol of their protest against the inhuman behavior of their government and their parents' values of advocating material enjoyment. Young people often hand each other a Mary Warner cigarette and take turns smoking. Smoking marijuana has become their "ceremony" against the government, society and parents. With the development of the anti-war movement, the trend of smoking marijuana is getting worse. Later, after the Vietnam War, the "hippie" movement disintegrated, but the trend of smoking marijuana still exists and continues to spread, almost permeating the whole American society and becoming the most widely abused drug in the United States. In 1970s, the abuse of cannabis spread to Europe, Oceania and even African countries. In recent years, some countries in Asia, such as the Philippines, Vietnam, South Korea, Singapore and other countries, have also widely smoked marijuana. In China, only in the cannabis producing area south of Tianshan Mountain in Xinjiang, some people use cannabis to make hemp smoke. Although it was strictly forbidden after liberation, some people stole it.

The processed cannabis leaves and hashish resin turned into a brown cake with a pungent smell. One way to smoke is to mix it with tobacco after mashing, and smoke it like a cigarette. The other way is to directly apply refined sesame oil to cigarettes for smoking.

In addition, they can also be mixed in food, chewed with hemp leaves or inhaled with powder.

The teratogenic, carcinogenic and mutagenic experiments of cannabis were positive. Long-term smoking marijuana will cause degenerative encephalopathy in the brain; Can induce toxic psychosis, such as insanity, paranoia and paranoid schizophrenia. The mental dependence of marijuana is certain. However, the physical dependence and tolerance of marijuana are still controversial.

The physiological effects of cannabis mainly include cardiovascular system, respiratory system, immune response and EEG. Its tolerance is limited and relative, which is related to dose. Long-term marijuana users can have mild to moderate withdrawal reaction after stopping 10 hour, reaching the peak in 48 hours, and this process can last for 4 ~ 5 days. These reactions and symptoms include tremor, sweating, nausea, vomiting, diarrhea, irritability, anorexia, sleep disorders and so on.

Long-term marijuana users have partially or completely lost their social and professional functions, and are addicted to marijuana or trying to obtain such substances. It can produce a kind of "unmotivated syndrome" or "complete apathy", which is characterized by indifference, sluggishness, laziness, emotional boredom, irritability, sleep cycle changes and so on. This has a great destructive effect on the physical and mental health of teenagers. Cannabis users will lose interest in personal appearance, hygiene and diet, and their personality will change, leading to "disintegration of personality", decreased enterprise, or complete loss of work, life and learning ability. Such people often commit crimes and attacks that endanger society.