Which would provide the longest high, snorting(intranasal) or sublingual(under the tongue)? I have 30 mg MS Contins. I have been snorting half of a pill crushed but the high doesn't seem to last very long. Oral consumption lasts 8-12 hrs, too long for me too do anything important. Smoking in a vaporizer seems to work, but there is NO drowsiness at all(but my pupils pinpoint so i know the morphine is being ingested properly)? Any ideas anyone? addition: I also take 0.5 mg of klonopin daily for panic attacks, and have noticed that my pupils stay pinpointed for long periods of time when snorting the pills.Any reason why?