You state: "So if the device was always on, 24/7, there might be a cause for concern. But if what PG&E states about the limited transmit time is true, your cellphones, Wi-Fi internet, and microwaves are probably causing your body more damage than a smart meter would."
According to PG&E, a Smart Meter transmits on average meter about 45 seconds per day, but could be as high as 14 minutes (875 seconds) per day.. This transmission occurs all throughout the day and night averaging 2 seconds per hour.
But that only tells half of the story.
According to PG&E, there are on average about 10,000 transmission per day (about 7 times per minute) and up to 190,000 times per day (about 132 times per minute). http://blog.sfgate.com/energy/2011/11/03...
The continuous pulsed signals are well-documented in online youtube videos.
This is like getting hit in the head by a sledge hammer once every 8 minutes. Yes, this is cause for concern.