Tell us about yourself!
True, good point, as the zinc used with galvanized creates a toxic fume which results in a fever. Weld it outside and use a very good fan to direct the fume away. Otherwise, you'll feel like crude for a few days. I like using conduit, too, and am considering to fabricate a 38 foot truss bridge with the stuff.
Metabolism and body process can and does, at time, put one drug process on hold to handle another. In the pharmaceutical or toxicological world this is called a competitive inhibitor. A classic example is treatment of ethylene glycol poisoning, which I'm not going to go further with here.