I can't seem to play the video, but here's my experience:
I used to work for
Pete Lien & Sons inc.
In addition to being physically sound, with a doctor signing off on my hearing, sight, lung capacity, drug test, range-of-motion, etc., one *condition of employment* (= perfectly constitutional) that I had to agree too was that I was not a smoker, and that I would not start smoking, even just one cigarette, for the duration of my employment.
Falsifying my answer or violating this policy at anytime during my employment would have resulted in immediate termination.
In addition to raising the company's portion of my insurance premiums, smoking was banned due to the following job related hazards/working conditions:
1. Resporators. Smoking reduced or eliminated one's ability to use a resporator, which was a daily must on some jobs (mine included).
2. Fine dust. The apnosphere within the prosessing plants contained fine dust. A smoker's pre-existing diminished lunge capacity would only be exacerbated by this fine dust. Also, this fine dust would greatly increase the risk of infections in the lung for smokers.
3. Hand pumped Gasoline and Diesel. Each Operator was required to fill their own flue tanks for their Front Loader/Forklift/Truck, etc. Nedless to say, fire + gas fumes = bad day.
I remember some fringe reasons as well, like people wanting to take extra brakes, cigarette butts falling into Haydite block mixtures, etc.
ps. Most quarries that produce Haydite will let you buy some in small, privet quantities.....like a 5 gal. bucket full......and Haydite is great for guardens.