Already moldy tea should not be consumed. Some people think it is a pity to throw it away, so they simply sun-dry or air it, intending to brew and drink it. This is very dangerous, because moldy tea often breeds many harmful molds and secretes toxins harmful to health. Drinking such tea often causes abdominal pain, diarrhea, dizziness, and other symptoms. In severe cases, it may affect certain organs and trigger diseases. Therefore, never lose more for the sake of a little gain.

Smoked tea, like other burnt foods, easily produces some 3,4-benzopyrene, a dangerous carcinogen. Accumulation in the body increases the risk of cell mutation and cancer. Therefore, severely smoked tea is not suitable for drinking.

Of course, generally mildly smoked tea, after being stored for some time, will have its smoky taste automatically disappear or lessen. After testing, the content of 3,4-benzopyrene in such tea is within the allowable range for food and will not cause harm to the body.