You ignore it it will catch you

You Ignore It,
It Will Catch You.
You Fear It,
It Fears You.
You Stop,
It Stops.
The Yellow Monster
Is Not Colored With Yellow.
It Is Colorless,
But Has Your Smell
That Is Way It Follows You.
The Yellow Monster
Do The Same Thing You Do,
Except
It Does Not Remember What It Does
And It Does Not Remembers You.
But It Follows Your Smell
And Keeps Following You