non nano is for skin absorption. lungs may be different. ask any floridian tweaker
How would you breathe it in if it's in a lotion or cream? Could happen in the mixing process if you're making your own, but not if you buy it premade. I wouldn't worry about the non-nano version. Has to be safer than avobenzone:
Although avobenzone is considered safe, disintegration products may have significant health impacts and persist in the environment. A recent study at Lomonosov Moscow State University found that chlorinated water and ultraviolet light can cause avobenzone to disintegrate into various other organic compounds, including;
aromatic acids,
aldehydes,
phenols, and
acetophenones which may have adverse health effects.
I would be careful using any ringed hydrocarbon in the presence of Cl (pools and saltwater), since many of the toxic chemicals that humans have made are chlorinated hydrocarbons (ddt, PCB, etc.).