Wiktionary shows this:
-ing
Used to form nouns or noun-like words (or elements of noun phrases) from verbs, denoting the act of doing something, an action, or the embodiment of an action.
- As true nouns.
- My hearing is not good.
- I have had several meetings with him.
- As gerunds.
- Smoking is bad for your health.
- She has a habit of sleeping late.
- I like meeting people.
Used to form nouns denoting materials or systems of objects which are used or employed in an action, or considered collectively.
- Roofing is material that is used to roof.
- Clothing is material with which one is clothed.
- The piping is a system of pipes considered collectively.
What is the difference between these 3 examples? Why is "Smoking is bad" the smoking a gerund and not a noun? The true noun makes sense to me, but at the same time what is that, how does it compare to the gerund? The last one is also a noun, how does that compare to a gerund? How/why is a gerund not a noun?
It says a gerund "is a verb that’s acting as a noun... but it doesn’t stop being a verb...". But it still functions as a verb in some ways? I don't follow.