Myth 10: "I've got nothing to worry about, I've had my yearly check-up and it's all clear"
Asthma is a very variable condition. One day you may feel fine and the next you cannot breathe so, just because you showed up clear on the day of your breathing test doesn't mean you should ignore other symptoms. If you experience problems such as wheezing, breathlessness or tightness of the chest (which may occur some hours after exposure), make sure you report them to your GP, explaining that you work with isocyanates. A urine test (in addition to the annual ones you should be giving) should show up any exposure to isocyanate.