Wrong thread to post a question like that. You need to be in basic drug discussion or drug culture.
In my experience oral is the best route of administration for Morphine. Sniffing it is a waste ime but some like it and some claim it's inactive when sniffed just have to see what works best for you. A high oral dose of Morph is one of my favorite opiate highs very nice.
Morphine is actually pretty potent when taken orally still with a tolerance I can still get buzzed off 30-40mgs which isn't much really.