[gls2ro]

One is not like the other.

Humans have eat potatoes for about 8000 years. So that seems to be a pretty large scale experiment.

While deciding to put a safe amount of a dangerous material on a product used in large scale is not a good decision.

Not sure how to explain (as I have little time now) but here is a simple way: - both potatoes and led have safe and dangerous levels - one - potato - was used since at least 8000 years ago - the other was not used on such large scale

It seems to me that we need to define safe levels in other way:

- safe levels on small scale and uses rarely

- safe levels on large scale or used constantly

[nearbuy]

Unfortunately it's an 8000 year experiment with no control group that can only detect large or acute effects. We don't know if regular exposure to potatoes slightly decreases IQ or increases risk of cancer or any other effects. (And, in fact, potatoes grilled over a fire are suspected to be carcinogenic.)

With leaded gas, the problem was also these small, long term effects that had never been established despite lead being used for thousands of years.

[klipt]

The Romans were using lead thousands of years ago too.

Small amounts of lead don't kill you immediately, they just make you a little dumber, a little more aggressive...