only 100% organic pine cones from trees that are on the safe wood list are ok for chins, from what i have gathered. no cones from spruce trees! (spruce is toxic to chins)
so unless you know for sure that the pine cones you see are from a chin safe tree, have never been sprayed, the tree itself has never been sprayed with pesticides or fertilizers, and you prepare the cones right (i believe you scrub boil and bake them just the same as wood preparation?), then don't consider them for your chins. buy them from a chin safe vendor instead.