I huffed gas when I was twelve years old. Someone at school told me it was the coolest thing ever and that you would see stuff. I tried it and saw tons of cool stuff, in my opinion. Me and my friend kept doing it. I did it for about a month on the weekends, usually, and one month later I was failing every single one of my classes and had to do summer school. And I was a straight "A" student every year.
The point is I wish I never ever tried this stuff. It's taking away a lot from my life. If anyone is thinking about trying it, don't. You'll hallucinate, but you wont notice the damage until later, and for me, the damage was terrible. Don't try this crap, really, seriously don't try it. If anything, just pot and beer. Not all the crazy crap that will take something away from your life. I hate gas.