Iron work?? Yep, not a good idea. Was a time when safety meetings amounted to a couple of beers, but those days are long gone. I was building ski lifts 40 yrs ago, and we were burning buds at lunch, one of the knuckle heads went a drove a 20 ton P&H down the path with the boom in the air, ran into a 14KV line, blew transformer and luckily did not burn the tires off and smoke him. That took care of smoking the blunts while at work. These days, I wait until I am at home, or somewhere I am going to be for a few hours before I tilt one.