Originally Posted by Hajo Flettner
The reason why you should take out the stems is that stems contain far more nicotine then leaf while holding none of essential oils that impart flavour to tobacco. Since taking out, cutting up and mixing back in the stems is more work then simply throwing them away I can't imagine any reason to keep them. Since excessive amounts of stems is a sign of poor quality control I avoid brands that have excessive amounts of stems.
I hate stems too. But, in reference to this. You answered your own question, stems are pure nicotine pretty much, if you leave them in it'll give you a bigger buzz. (I'm still gonna pick em' out though)