If you work regularly with art or craft materials that are toxic, be aware of symptoms that might show your susceptibility to various chemicals. According to "Safe Practices in the Arts and Crafts: A Studio Guide," you should be suspicious if:
* you develop asthma as an adult. Asthmas beginning in adults almost invariably come from environmental contaminants.
* your symptoms are worse when you work -- especially after long sessions -- and improve when you stay away from your studio.
* you have an increase in the frequency or severity of your respiratory infections, especially those in which you are short of breath.