The origin of tobacco? Originated from?

Tobacco originated in America, and Indians found that it contains substances that can excite nerves, and smoked its burning cigarettes in tribal meetings and sacrificial activities.

Spanish colonists brought it to Europe. When the earliest Spanish sailors returned to China to smoke, they once frightened people in their hometown and thought they were dealing with the devil. But soon, the use of tobacco was implemented throughout Europe and spread all over the world. Tobacco was introduced to China in18th century.

Tobacco contains nicotine, an alkaloid, which is neurotoxic, especially fatal to insects, but it can stimulate human nerves, and its tolerance will increase after long-term use, but it will also produce dependence.

According to research, all the nicotine contained in three cigarettes or half a cigar can kill people, but the nicotine inhaled by smokers is only a small part of it. Tobacco can also be used to make pesticides and extract nicotine, malic acid and citric acid.

Extended data:

Tobacco is a thermophilic crop and is sensitive to temperature. Different temperature conditions have great influence on the quality and yield of tobacco. The temperature requirement of high-quality tobacco leaves in the growth period is lower in the early stage and higher in the later stage. When the average temperature of the day is higher than 35℃, the growth of tobacco plants is inhibited, the leaves become thicker and harder, the nicotine content is too high, and the quality becomes worse.

Low temperature can promote the early development of tobacco plants, but different varieties have different responses to low temperature. For all types of tobacco, the temperature below 65438 03℃ is generally not desirable, especially in humid weather conditions without light. Under the good growth conditions of sufficient sunshine and average daily temperature of about 27℃, tobacco ripens in 80-90 days after transplanting;

In cold weather, it takes 100- 120 days to mature. Insufficient light will lead to the slow growth of tobacco, and the leaves can hardly mature normally, resulting in inferior tobacco leaves. In the middle and late stage of field growth, if the daily average temperature is lower than 20℃, the transformation and accumulation of assimilates will be inhibited, thus hindering the normal maturity of tobacco leaves. The lower the temperature, the worse the quality of tobacco leaves, such as frost leaves caused by early frost in the late growth stage, which will have no use value.