Personally, I don't think it's true. Tea is the national drink of the Chinese people, tea has fitness, quench your thirst, the effect of healing, and rich appreciation of interest, can cultivate sentiment. Most experts say that drinking tea can also prevent cancer, diabetes, heart disease.

Tea contains a variety of chemical components, the separation and identification of known organic and inorganic compounds amounted to more than 700 kinds of , including primary metabolites of proteins, sugars, fats, and secondary metabolites of polyphenols, pigments, theanine, alkaloids, aromatics, saponins and so on. Research shows that tea has a preventive effect on cancer.

Drinking tea can inhibit the occurrence of oral tumors in golden gophers induced by the carcinogen dimethylbenzanthracene; green tea, black tea, Tieguanyin, flower tea and large-leafed green tea can inhibit esophageal tumors by blocking the synthesis of the precursor of the carcinogen methylbenzylnitrosamine in the body of rats. Regardless of which tea, there are different degrees of preventive effects on chemical carcinogenesis or transplantation tumors in animals.

Experts also screened 18 major components of tea and found that tea polyphenols and catechin monomers have a preventive effect on the occurrence and development of cancer, tea polysaccharides and caffeine and so on, and the oxidized products of tea polyphenols, theophyllin, and tea polyphenols are also equally effective. Theophyllin is the main component of black tea and oolong tea.

Epidemiological studies have shown that smoking is associated with human tumors, especially with lung cancer. Selecting habitual smoking volunteers to drink green tea, black tea, blended tea and tea polyphenol tablets respectively, the results show that tea drinking has a significant protective effect on smoking-induced oxidative damage and DNA damage.