Scent is the all-time memory-keeper.
Scent can unlock forgotten memories.
Scent is a powerful memory trigger.
Thanks to olfactory nerve which located next to amygdala. Amygdala is connected to the experience of emotion as well as emotional memory. It is also next to hippocampus which is responsible in the making of new memory. Pretty clear, right? Our brain will associate scent to a memory that have emotion relation to us. The next time you smell that scent, your brain will automatically relate it to a moment, place, or person.
That is why every time I smell Glade Apple, I think of you.