Not plain stems, but would it be worth it to grind up the stems in to small pieces and mix it in with the rest of the week? Would help get more out of it.
Omg no. Do not grind up stems and smoke them. They do not contain anywhere near a reasonable level of THC, the negatives of smoking it outweigh any sort of good.
The only *real* use for stems is cooking or extracts, and then you will need lots. Use the search engine for those things.