u/Ancient-Aeroplane18

I can generate a bunch of hydrogen gas using caustic soda, water and aluminium foil. I approximately have a 0.5L hydrogen gas filled balloon.

Can I just breath that in to change my voice for fun?

Is there anything bad with it OTHER than accidentally igniting it inside my lungs / inhaling too much of it causing hypoxia?

I don't think I contaminated the mixture with any other gases cause the aluminium and NaOH I used was of lab grade purity.