what is the cause of excessive tearing and sweating when one ingests a poison?
One common class of poisons is organophosphate poison. These have been used as nerve agents and insecticides. They are basically inhibitors of a cholinesterase enzyme that functions to inactivate the cholinergic neurotransmitter produced by certain nerve endings. This substance functions to cause increased sweating, tearing, bronchial secretions, bowel motility and diarrhea, vomiting, urination, and shortness of breath among others. These are serious poisons.
Causes of Excessive Sweating – http://livesweatfree.com