Does the application of vicks on my nose break my fast?
In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
The topical application of Vicks does not invalidate one’s fast. A substance with a discernable body must enter a valid entry point to potentially break the fast. Merely smelling or feeling the effects of Vicks within oneself will have no implications on one’s fast.
And Allah Ta’āla Knows Best
Mufti Faraz ibn Adam al-Mahmudi,
 فتاوى دار العلوم زكريا ج 3 ص 274 زمزم