FJC-
At one time I smoked it daily, 2 to 3 times a day, mostly "recreationally" I guess. I remember having a LOT of anxiety when my hook-up was out and I couldn't find any.
Gave it up for about ten years, then when back and didn't really like it, so I stopped. Gave the bag away to one of my smoking buddies for Christmas that year, made her day.
In my own, humble, opinion...your wife is rationalizing. I'm an alcoholic, and I thought that 15 beers a day helped my "anxiety".
She'll probably do what she wants to do. Don't let it jeopardize YOUR sobriety.
Good Luck,
Zube