The lack of understanding about possible cancerous effects of CRT screens worries me, especially with stuff like this and "digital" displays.
The lack of understanding about possible cancerous effects of GMO food worries me...
The lack of understanding about possible cancerous effects of inert silicone gel breast implants worries me...
Someone over 30 can fill in earlier examples: "The lack of understanding about possible cancerous effects of $NEW_TECHNOLOGY_I_DONT_UNDERSTAND worries me. I'd just hate to find out 20 years down the road that $NEW_TECHNOLOGY was slowly killing us. "