Using gas chromatography–mass spectrometry, researchers identified dozens of volatile aroma compounds released from heated green tea leaves (Camellia sinensis). The study demonstrates how warming botanical material liberates complex aromatic molecules into surrounding air, offering insight relevant to non-combustion vapor or steam-based herbal preparation.

A practical overview describing how herbs such as eucalyptus, chamomile, and thyme are traditionally added to hot water to release aromatic vapors. While not a clinical study, it provides historical and methodological context for herbal steam inhalation rituals.