Meanings of morphia habit in English

A man gets the reading habit, just like the morphia habit, or anything else of that kind.

She was on the verge of the morphia habit, and I was trying to break it off abruptly.

My idea is this: The man now becomes such a complete slave to the morphia habit that concealment of the fact is scarcely possible.

He was a man of unusual skill, but blunt and unsympathetic, especially in cases wherein he suspected deception-anelement almost inseparable from the morphia habit.