Can wasabi peas go bad and cause food poisoning? ate some for first time ever, already were sitting in cupboard for while. felt flu-ish next few days

Not food poisoning: Dried foods like wasabi peas are an unlikely cause of food poisoning, and "flu-ish" symptoms don't suggest it. The main symptoms of food poisoning are gastrointestinal -- nausea, vomiting, diarrhea, etc. And food poison symptoms generally clear up on their own within 1-2 days. Almost certainly your symptoms have nothing to do with the wasabi peas. See a doctor if they continue or become severe.