Back before I was an addict and could get high off of about 60mg of oxy i found chewing up about 80mg of OPs would get me good, also when i had 0 tolerance and this was probably the beginnings of my relapse, my friends mother passed and left behind like 200 OP 40s. I would buy them and chew 1 with 0 tolerance and it was good. In his defense i was buying them for a coworker and not telling anyone i was getting 1 or 2 for myself... yeah the beginning of a relapse for sure.
My point is orally with 0 tolerance chewed, which was gross btw, got me good but i never experimented with any other way.