using commas between two different objects

0

My sentence is { Non-smokers spend less money buying medications, cleaning their teeth professionally, and maintiaining their houses.}

In my sentence, I think it should be a comma between "cleaning their teeth professionally, and maintaining their houses. Because I am using the comma to separate a list of things:

buying medications

cleaning their teeth

maintaining their houses

Also, I want to know if it is correct to say, "lowering the risk of having their houses on fire, or lowering the risk of having a house fire."

See example:

Non-smokers spend less money buying medications, cleaning their teeth professionally, and maintaining their houses including cutting down on cleaning bills and lowering the risk of having their houses on fire.
asked Nov 23 '13 at 18:32 Najah Samir Shuqair New member

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