adverbs - Moreover between commas

While writing, I am often tempted to write sentences as:

It is, moreover, clear that...

or

We have, in addition, other things to take into account.

Is the use of the conjunctive adverbs and locutions (also furthermore, additionally, besides) allowed between commas, as it is in other languages? Also, does it sound weird or incorrect when found in a written text?

Answer

It seems very natural to me when I come across this usage (a comma on both sides of such a word/phrase). Moreover, Google Search supplies a sample sentence in their definition for "moreover" that employs the word betwixt two commas; "Lindsey is going to the wedding, and moreover, she'll be singing..." However, I typically place it at the front of the sentence, but that's just preference (or habit). Also see these links confirming this:

1. Furthermore: " in some cases it is used in the middle of a sentence."

2. Example: "swimming alone is against the rules and, moreover, it's dangerous."

How I would put it in the middle of a sentence would be as you did, without the inclusion of "and", which seems to interrupt the flow somewhat; "the cellar was dark; moreover, mice nested there" (TheFreeDictionary.com/moreover)