I used to do it. The high is a little more thebainey though. They are much weaker though by weight. I forgot the ratio but it was something like 8-10:1, where 8g to 10g of stems equals 1g of pod material.
Having to use stems for tea after I ran out of poppies was a bummer. Not satisfying. I shudder at pod withdrawal. One of the most dramatic things i have had to go through. I remember even good quality heroin not fully covering the 40 or so alkaloids in the plant matte when in withdrawal. Natural opium is strong and long lasting.