hydrogen is so light,, that is escapes the earth atmosphere .. now maybe.. just maybe,, when you smoke marijuana the hydrogen gets trapped in your skull and you get high..
really, you inhale HYDROGEN for a squeaky voice? remind me to NEVER attend any of your parties that include balloons...
hydrogen will make your voice higher too,, hydrogen is not inert like helium ... so it could be harmful if inhaled ..
Well, in my defense, I was stoned, and hydrogen works too.. Well, I don't know about the squeaky voice, but it does make shit float =D