From personal experience, even when I was not experienced with opiates (a long time ago in a galaxy far, far away...) I would say that 10 mg isn't enough for rec purposes, 20 mg is more like it. I'm assuming you're taking it orally? Morphine gets chewed up pretty quick by your liver by that route (it's called the "first pass effect"), IVing or plugging bypasses this, although your liver will metabolize it eventually.