>>16I actually did huff gas/flyspray/glue several when I was ~14 and trying to fit in. The warning on those Erowid experience reports "their psychoactive effects are inseparable from nerve and organ damage" does match up with my experiences while huffing - there's not much to recommend it.
The trouble is, most people who huff do it when they are young and inexperienced with other drugs. So the reported effects you read about would seem exaggerated to somebody who smoked weed or taken acid/etc. There's no hallucinating or the kind of sensory input confusion that makes hallucinogens so interesting, your brain just breaks down for a few minutes.
To somebody experienced with real drugs, the sensory effects of huffing are only mildly enjoyable and not at all novel. You basically just tingle all over, feel slightly drunk and euphoric, and senses become extremely distorted (hearing noises, seeing things that aren't there, paranoia, etc.) for a few minutes and then it wears off.
Smoking that mexican tripping weed shit is far more bang for your buck if you want an intense 5 minute high. And it won't leave you a drooling retard for life like me.