First, yes, you can smoke stems, but they are harsh and not too potent. Back in the day when we were out of grass, we would gently ( use pulse) blenderize inch long chunks of stems to remove the outside bark. Then we would sift the stem bark out of the chopped stems and smoke it. If grass was plentiful, we would stick the blenderized stems in just enough vodka to get them wet and let it soak for a week or two. We'd strain out the stems and soak some so-so grass with it. Then spread the soaked grass out on a cookie sheet or two. Let the vodka evaporate from the grass. Smoke. It will improve even the blahest schwag. Smoking seeds is just a waste. No THC at all. Gives you a headache and a cough and tastes bad. Save your seeds and plant them or toss in a secluded area. (Hey, you may come back in a few months and find a happy crop.) Think what this US of A would look like if we all just tossed those unwanted seeds. Happy thought!