Iolites are a lot more discrete than a using volcano. . . but I've never used either out in public where the extremely low decibel noise (hissing every 45 seconds) would be a problem.
what type of vaporizer are you using?
I have found that the units with 'whips' or rubber tubing always give me a sore throat.
The Volcano and the Iolite hand held units do not do that.
Many strains need different settings so experiment with temps.
I've been going to Humboldt Medical Supply and the Humboldt Collective at 855 8th St in Arcata for a few months now.
LOWEST prices around and all products are grown/produced by the collective members. They have a good variety of strains and nice people.
(707) 825 6700. Open on Tuesday...