"Maté consumption plays a significant and independent role in the development of upper aeodigestive tract cancers," and "Maté drinking should be considered one of the risk factors for cancer of the neck and head."
The beverage maté: a risk factor for cancer of the head and neck.
Goldenberg D, Golz A, Joachims HZ.
Head Neck. 2003 Jul;25(7):595-601. Review.
PMID: 12808663
DOI: 10.1002/hed.10288