I've read that some herbal teas are dangerous and that many types of fish can cause disease. Here is a quick run-down. Kombucha mushroom tea has been reported to cause an over-acid metabolism and serious fungus infection. Germander, comfrey and gordo-lobo teas contain liver toxins.
Chaparral tea can cause liver failure.
Paraguay tea may be associated with profound changes in mental status. Red snapper, grouper, sea bass and other reef fish may contain dangerous ciguartera toxins that can lead to death from paralysis, even if the fish has been cooked. Sushi, because of the fish tapeworm it may contain, can cause anemia and inflammation of the pancreas. Truly, our lives are far from risk-free. Be sure to mention the title.