It is rather interesting that smoking started off a religious ritual and was also prescribed by the tribes doctors to be used during debates - especially concerning treaties.
http://www.snowwowl.com/naartpipes.html
The Native American Peace Pipe prescibed by Indian medicene men is not under attack by our governmental medical establishment . Tobacco was a sacred plant used for prayers and to introduce peace of mind (anit-stress). And stress is the number one killer of our times.
Attacking tobacco is likewise a crusade agenest the shaman religion.
But the point is that tobacco started of as prescibed medicene, just like those other drugs that have deadly side effects for some people being advertised by the durg companies as a seditive for "nerves". (aka - stress).
They do not want you to take a smoking break because then you would not become upset by the boss and would not have to work off your resentments by working faster - to work off the extra energy of stress by being more productive or constructive.
Keeping you stressed out, with fear and anger, makes you more managable and controlable for the bosses manipulations.
Technosoul.