You are 100% right on the indian curry smell. I don't know any that carry curry powder around, but I wouldn't doubt it happens. Maybe it's like blacks (and Hillary Clinton) carrying around hot sauce or something because they've blasted their taste buds and can no longer enjoy subtle flavors.
I have lived in an apartment complex that has many indians. The ones that cook you can smell by walking near their apartment. The ones that use the apartment gym make it smells like bad curry and extreme BO. When their gone, the odor still lingers. In the communal spaces, they often have large celebrations with indian food and it makes the communal areas have a curry smell. Its also the worst food on the planet and I do not understand anyone who enjoys it.