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My digression is causing me a great deal of concern when trying to write this sentence :-)
Correct: His habit of digression from the topic made it difficult to learn anything from the lecture on the extinction of the dodo bird.
Working in this job was a digression from his long term goals.
Digression
The digression in the conversation wasn't subtle.
To digress means to stray away or deviate from a topic in a conversation or argument.
DIGRESSION - a turning aside; getting off the main subject