Final answer:
Histamine (scombrotoxin) is indeed a naturally occurring chemical hazard, true. It's associated with scombroid poisoning from eating certain fish that haven't been properly stored.
Step-by-step explanation:
The statement that histamine (scombrotoxin) is a naturally occurring chemical hazard is true. Histamines can be found in certain types of fish, such as those in the Scombridae family, which includes species like tuna and mackerel. When these fish are improperly stored at warm temperatures, bacteria can grow and produce histamine and other biogenic amines in high levels, leading to scombroid poisoning upon consumption. This condition can cause symptoms such as headaches, rashes, and gastrointestinal discomfort. Histamine is also an important neurotransmitter and immune system mediator in the human body.