It's not a double. It was a low budget film because it was one of his first movies. That's him the entire time. He still does his own stunts even in the Mission Impossible series.
Did you read the disclaimer at the bottom of the page? Seriously, you don't make any sense.
Those people are idiots. It's just cement... there's worst stuff in the air that we breathe everyday. I'm sure a majority of the people who commented on the "cancer causing dust" probably smoke a pack a day.