Here's Why

Asthmatic tomatoes

Tomatoes may prevent asthma attacks, except when they cause them.

References:
Occupational Asthma in Tomato Growers following an Outbreak of the Fungus Verticillium albo-atrum in the Crop
Occupational asthma in greenhouse tomato growing
f25 Tomato allergens
The role of foods in asthma
Grass pollen allergens cross-react with food allergy proteins in tomato, lettuce, onion, celery, corn and sometimes carrots.
Nomato
Tomatoes Are Evil

About the author: Ian Woolf lives in Sydney, has a degree in Applied Science, worked as a solar astronomer, software engineer, systems programmer, webmaster, research assistant, Cisco CCNA tutor, Physics laboratory demonstrator, Computational Theory lecturer, and subject coordinator; while changing his career to freelance writing and broadcasting. Listen to Ian on the Diffusion radio science show on radio 2SER 107.3FM Monday at 6:30pm in Sydney or streaming audio on www.2ser.com, or listen to the Diffusion podcasts. You should follow me on twitter, here