I'll be going into my 2nd year of college and I've been welding for 4 years now during school. I've always wondered if breathing in the fumes and smoke are affecting me dramatically. I do notice every summer I improve my times a lot more than the other runners but it seems whenever I get into season and start putting myself in that smokey environment I only improve a little compared to the other guys. Anyone else that's a welder or has an opinion on this please comment