Question:

Will a nicotine patch break the fast?

Answer:

In the Name of Allah, the Most Gracious, the Most Merciful.

As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.

One should try and free himself from being enslaved to nicotine.  The collateral damage caused by smoking is well known.
Nevertheless, the use of transdermal nicotine patches whilst one is fasting will not invalidate the fast.[1]

And Allah Ta’ālā Knows Best

Mufti Faraz Adam,
www.darulfiqh.com