a liking or habit of doing something
penchant - liking
A ‘penchant’ is a strong and continued inclination to do or use something, or a keen appreciation of it. The term generally refers to something that may be seen as an acquired taste or, at the very least, not typical.
Carol is a good co-worker aside from her penchant for playing practical jokes.
David has some strange hobbies. I believe collecting stamps is one of his penchants.
My uncle has a penchant for Cuban cigars, so I got him a box for his birthday.