The thing is people mistrust governement warnings. People don't really trust the governement when they set arbitrary levels at which consumption of a toxic chemical becomes "safe". The reasoning is if something is bad for you, then best to stay away from it altogether just to be "on the safe side".

Mind you, people still consume lots of fat, a substance widly proclaimed to be unhealthy as well as a whole lot of other her "unhealthy" food. In fact it's scary how many toxins we probably consume on a daily basis in our polluted and chemical-ridden world.

Hmmm I wonder if any of these people abstaining from tuna are smokers.