A tiny bit of hydrofluoric acid will kill you. 10x as much hydrogen will make a birthday candle. We're not comparing eye irritation to taking the roof off your house.
It's largely a moot point anyway. Most people keep at least one lithium ion battery on their person and almost none of them have issues. Plenty of folks keep multiples.
HF is a weak acid, work with a solution (fairly concentrated) of it's salts at low pH and the HF gas can be given off. HCl and HBr are similar but less volatile and more dense, worked with all those. Used to generate the dry gases from the salt solutions by adding the stronger acid sulfuric/H2SO4 in special apparatus. Pure bromine Br2 is liquid at room temperature, that evaporates off as a red gas. That will hurt you too.
I used to work with all kinds of other nice stuff, like phosgene. If you breath enough to smell it you will be dead soon. We got it in gas cylinders and collected it in volumetric cylinders immersed in a dry ice bath ( -78 oC), the bath made in a Dewar flask. It boils at 5.5 oC.
It could only be worked with as a liquid, in a well working fume hood, with the sash kept low. When finished, everything had to be quenched before it came out of the hood, even your gloves. We hung tissue paper on the bottom of the fume hood sash to be sure the hood was pulling good vacuum. We didn't trust the electronic hood monitors with our lives.
Now hydrogen I did low and high pressure reactions. The high pressure ones were conducted in a lab called "the bomb room". It was a huge reinforced concrete bunker with blow off doors on the ceiling. Once you set things up everything was controlled remotely, in another room with a 6" window of plexiglass. Used things called Parr reactors that held 3000-4000 psi of pressure and we heated things to 200 oC.
So you guys know more about toxins, chemistry, and hydrogen? Tell me more......
