Lava itself releases toxic gases, including carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrofluoric acid. When lava interacts with seawater a variety of other toxic gases are produced, including hydrochloric acid, which is highly corrosive. The lava haze, or laze, as it is called, can be deceptively deadly.
https://www.earthmagazine.org/article/danger-paradise-hidden-hazards-volcano-geotourism
Vog does not bother me other than the crappy visibility. Some complain of all sorts of ailments from it.
I was being a smart ass.