وَالشَّمُّ وَهِيَ قُوَّةٌ مُودَعَةٌ فِي الزَّائِدَتَيْنِ النَّابِتَتَيْنِ فِي مُقَدَّمِ الدِّمَاغِ
Smell is described through two structures in the front of the brain in the classical anatomical account.
Its special object is odor, pleasant or unpleasant. The passage describes air associated with an odor reaching the organ of smell. This is historical physiological vocabulary, not a complete contemporary anatomical theory.
If a fragrance is perceived in a room while no flower is seen, the odor is sensed directly. Concluding that a flower caused it is an inference that could be wrong; another object may have produced it.
What a sense reports and what we infer from its report must be kept distinct.