THC flows throughout the plant. There are minute amounts in & on the dried stems. The larger stems have the least percentage of THC & will give you a headache & irritate your throat & lungs the most. If you kief the large stems they work well for cooking. The smaller stems WILL get you high. It's a different kind of buzz & your lungs & throat will still be irritated. I recommend using a bong. I grind them to gritty bits (grits). Grits smoke better than powder kief. The stem bits burn much slower than bud & they expand as you smoke. I take two large pulls per hit, packing it down between pulls. After the first hit I dump the bowl out, crush & mix it & repack the bowl. Then I just repeat the two pull method again. The second hit is the hit that gets me buzzed. Many of the responses in this thread claim it takes several bowls to get high. Believe me, if it took that much effort, I wouldn't bother.