"Hans Lennros" <hans.lennros at swipnet.se> wrote:
>>We knew since the 1950s (maybe before) that tobacco was bad.
>I think the first disclaimers came in the 60s.
>>We still do not know today whether micrograms of Hg are causing any harm!
>Yes, we do.
>Less than one gram of Hg is lethal. That means that
>ONE MICROGRAM multplied with factor x is lethal.
By extension, one molecule of O2 is lethal too?? (multiplied with