Leasing changes the math on a lot of car decisions, and fragrance is one people rarely think through in that context. You are not keeping this car forever. That does not mean the smell should be an afterthought. If anything, it is a reason to be more intentional, not less.
A leased car usually comes with strict return conditions: no stains, no lingering odors, no damage. That rules out a lot of the DIY workarounds people reach for, sprayed cologne, oil diffusers prone to leaking, anything that risks marking a leather or fabric interior you do not actually own.
A hanging fragrance sidesteps all of that. Nothing sprayed, nothing that touches a surface, nothing that risks the kind of odor or staining issue that shows up on a lease inspection. It is one of the lowest risk ways to make a leased car feel genuinely yours for the two or three years you are actually driving it.
There is also a simpler reason to bother: you are going to be in this car every day for the length of the lease. Whether it smells like an afterthought or something considered is entirely up to a five minute decision made once, then forgotten about for weeks at a time as it keeps working.
You do not own the car. You still own the experience of being in it. That part is worth getting right, lease or not.