Chew a pinch. If they taste stale, toss them. Three weeks at room temps is pushing it.
[Could always make some Old Brittle Root Stale Pale Ale. Look on a Pogo website for the recipe. I know, I'm old.]
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk