Aside from targeting foreign objects in your body. These cells can be directed to utilize the same method for destroying cells to cauterize wounds from the inside as well as cauterize blood vessels shut in critical first aid. The nanites are also capable of coalescing within a certain area and layering themselves on top of each other in a manner that produces a hardening effect, should they need to protect something. The ability to destroy targeted cells would essentially mean that weight loss is available at the literal push of a button.
Nanites appeal to young adults, adults, and those of advanced age with chronic medical issues.
With an a limitless amount of applications everyone will have something to gain from the use of nanites!