Tea is addictive mainly because it contains a certain amount of caffeine, which can be addictive. Caffeine addiction is even classified as a mental disorder in the U.S. People who consume too much caffeine will experience symptoms such as insomnia and excitement, which is why some people can’t sleep when they drink tea. High doses of caffeine is harmful to the human body, long-term use of coffee drinkers suddenly stop, or reduce the intake will feel headache, fatigue, irritability, this is because the caffeine to a certain extent so that people are addicted to tea, but really appear to be sick like addiction is actually very few people, and the caffeine content of tea is relatively small. Tea contains caffeine along with another calming substance called theanine. The simultaneous possession of these two substances in tea ultimately makes the tea show a certain neurolepticity, and has a relatively good refreshing effect. In moderation, tea will not overstimulate or over-addict a person. However, you need to avoid chewing tea in large quantities, as this can lead to caffeine addiction.