I guarantee it's true. When I would reach a certain "milestone" in my work task, I took a smoke break (now
vape breaks) to clear my head and begin assessing and planning my task going forward. When I worked at places that didn't allow smoking, I noticed the difference in my work production and quality. I didn't have a reward of a smoke break, so I didn't setup milestones for myself and my day was never very well organized. I'm sure some quack of a doctor would say I have ADHD or some crap like that, but it's really all in my own mind. I have worked this way for 20 years, and it has served me well. Even to the point of outproducing non-smokers with better quality in my work.
These days, I slip into a hidden unoccupied area, hit the vape for about 5 minutes, and I'm good to go for an hour or so.