Tartarian aster (Aster tataricus) has a long history of use in traditional Chinese medicine (TCM), where it is known as "Zi Wan." It is primarily valued for its effects on the respiratory system, particularly in supporting bronchial health. In TCM, Tartarian aster is believed to moisten the lungs, relieve coughs, and expel phlegm. It is commonly included in herbal formulas designed to address conditions characterized by cough, bronchitis, and other respiratory complaints.

The traditional justification is documented in TCM texts and pharmacopoeias, where it has been used for centuries. However, scientific research on the efficacy of Tartarian aster for bronchial or respiratory health is limited. There are a few preclinical studies suggesting anti-inflammatory and expectorant properties, but robust clinical trials in humans are lacking. Thus, while there is strong traditional support for its use in the bronchial system, scientific validation is currently insufficient.

In summary, the use of Tartarian aster to support bronchial health is primarily justified by tradition, with some preliminary scientific indications but no significant clinical evidence. Its rating is moderate based on the depth and persistence of traditional use, not on strong scientific validation.