Coffee is both good and bad. It can help prevent cancers and type 2 diabetes in regular coffee drinkers. Coffee contains over 1000 aroma compounds and many antioxidants. Roasting coffee beans causes chemical reactions and reduces CGA's.
Teas are rich in antioxidants (polyphenols that are plant chemicals) and prevent cancer, heart disease, metabolic syndrome, stroke, obesity, and arthritis.
Even a good thing can be made into a bad thing. Some additives may cause allergic reactions. They are not always good for us and can be disgusting, like MSM which is Mechanically separated meat, and is all meats from everywhere mixed together. It isn't only in hot dogs...