Not only have we had proof of this for a very long time, the entire US industrial food industry is built around making processed foods as addictive as possible.
The narrative only revolves around the events of Deep Space Nine so you shouldn't have to read anything else. It also involves a lot of flashbacks filling in gaps in Garak's story. Odo wishes he could read this novel.
And in the US they insist religion will cure it. My sister in law had to demand medication, she just kept getting referred to AA. Guess which one finally got her sober?
Not only have we had proof of this for a very long time, the entire US industrial food industry is built around making processed foods as addictive as possible.