some are fragrant, a lot aren't - Lilium regale is very fragrant indeed, has white, streaked with yellow trumpets, hardy.

Most of the Asiatic hybrids don't have fragrance, and they are the most common yellow lilies in the garden centers or florists. If the flowers are bowl-shaped and upward-facing, and the leaves are fairly narrow, it is probably an Asiatic. They also come in white, as well as many other colors.