They're prepared to take risks by breaking the rules. They risk everything by breaking the rules just so they can break the records. Yes, it seems that nowadays people generally are suffering from more and more allergies. Many people are allergic to nuts - and some allergic reactions to nuts can be fatal. Another most common source of allergy is dust and pollen.
People can be also allergic to drugs - penicillin, for example.
Some of us are allergic to synthetic products, and some women are allergic to certain types of cosmetics. Modern living seems to produce more dust and therefore more dust mites. And it's the dust mites people are allergic to. Dust mites just love these conditions. Open the windows and vacuum frequently.