So this guy has a stroke, right?
And part of his brain is damaged. A little-known and little-understood part called the "insula".
After the stroke, he discovers that he simply "forgot" that he was a two-pack-a-day smoker. No cravings. No urges. No withdrawal. Not even a conscience attempt to quit. He just stopped.
Could this be a clue to stop addiction (whether it be smoking or something else)?