Smell or smelling

"Smell" can be simple present tense or the bare infinitive or the base form.
"Smelling" is the present participle.
These are used in a variety of grammatical structures.

You're smelling good today, Cassandra.
I've been smelling a rat for about a week now.
Bring me the smelling salts.
He came out of the trial smelling like a rose.

I know that smelling is the gerund of smell but my question is that smell and smelling are also nouns and that is my doubt. For example

Should I use Smell/smelling in the following sentences?

*The smoke smelling/smell affects me

*The best of that flower is its smelling/smell

AnonymousI know that smelling is the gerund of smell but my question is that smell and smelling are also nouns and that is my doubt

Can't win 'em all!

Use "smell" as a synonym for "scent," and use the gerund to describe the act.

That smell bothers me.

The act can be "performed" by the offending substance/object,
as well

Hi))
smell is used in Indefinite Form with the meaning has odour/scent

This flower smells good.
smell is used in Continuous Form with the meaning : to sniff at
The dog is smelling the ground in order to hit a scent.

anonymous I don´t know exactly the differences between smelling and smell. Can anybody explain it to me please?
Thanks a lot