Hehe, exactly :) the thing with gases is that the line between completely fine (campfire outside) to potentially lethal (liquid nitrogen evaporating in a small, poorly ventilated garage) can be harder to see and judge for an amateur than a lot of other things. Anyone would understand that they should avoid getting acids or toxic chemicals on their skin, and the protective measures are quite simple to carry out. The same is true for most flammable or explosive liquids or solids. So the idea behind my advice was really "If there's something that's likely to hurt you because you aren't properly aware of the danger involved and how to mitigate it, it's likely to be a gas, so be extra, extra careful around gases, gas producing reactions, and volatile compounds."