How common and natural is the phrase "as in aside" in spoken English?

As an aside, do you think he is going to help us?


It's fine (if not hugely common) when describing someone else's remark ("As an aside, he told me that..."). It doesn't strike me as very natural when prefixing one's own remark, as you seem to be doing here. Some other phrase would normally be used instead, such as "by the way".
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Hi Tom,

Please consider the following sentence too.,

You want to keep talking about the first thing after you say something else briefly, when you say "as an aside". Example: "As an aside, do you love Victoria?"

Saying as an aside is sometimes used as a polite way to change the topic and talk about something else. Example: "Then he says to me, as an aside, let's get out of this place."

You say "as an aside" when you are talking about one thing and you want to talk about something else then come back to the first thing." Example: "As an aside: Is anyone hungry?"

You could say "on an unrelated note" if you preferred, but "as an aside" sounds fine to me so show that you are briefly changing the topic.

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