No, go ahead and bin them, trust me.
But if you insist on smoking them, have fun... ewwwwww dead leaves... this is also why I would not eat roadkill just because it seems a shame to let it go to waste... I mean, shit, the leaves are DEAD and have been... yuck! At least if you are going to smoke leaves, save the nice frosty bud-leaves at harvest, and dry them out properly. But even then there's not much point (tastes harsh at best)... most peeps save them for hash.