In the building where I work there is major construction interior underway (renovation) with dust and fumes everywhere throughout the building and in the ventilation system. Meanwhile the idiot owner dosen't even want smokers anywhere near the building.
This is the kind of wackiness we are dealing with today.
It probably is safer to leave the buiilding to go out and have a smoke than to sit in your cubicle and inhale the construction fumes!
A few years ago, I did some part-time bookkeeping work at the local Humane Society.
One day, I developed a bad headache and noticed a horrible odor seeping into all the offices.
When I asked the operations guy about it, he said that when the building was constructed the contractor put the exhaust and intake ducts next to each other. On certain windy days, the noxious fumes from the heating system would circulate back inside the building.
You couldn't smoke inside, though.