As mentioned, TiO2 is perhaps the most common white pigment and is used in all kinds of things from candy to toothpaste to cosmetics. We eat a lot of it, and it's generally recognized as safe in the US (but not the EU!).
Si02 is just silica/quartz, and is the most common type of sand. It's usually an anti-caking agent but... it's sand. You are almost certainly getting some SiO2 any time you eat a vegetable. It is also generally recognized as safe.
The sickness is due to how the particles interact with the lining of your lungs, and breathing in enough to get ill effects will be much more than you consume through food over a short period.
There may be longer term effects, but I'd imagine we would have identified more of them by now, considering how severely dangerous silicosis is.
My property is built on the silt plume of a river that now empties out a few miles away. It does become a dust bowl when grass is removed and everything's dry. It otherwise stays in its place.
Si02 is just silica/quartz, and is the most common type of sand. It's usually an anti-caking agent but... it's sand. You are almost certainly getting some SiO2 any time you eat a vegetable. It is also generally recognized as safe.