Please name the respected organisations that encouraged smoking
I could have sworn that I'd seen ads where the US Surgeon General advocated smoking, but (alas) can't find them. Maybe "they" have removed them from the net ;o) . That said, up until the 50s, doctors would be quite happy recommending smoking to "relax" - though this may have had quite a lot to do with sponsorship from tobacco companies. Alas, there are probably no genuine endorsements on these ads:
http://lane.stanford.edu/tobacco/index.html and the "survey" quoted here is no doubt bogus:
http://www.i-am-bored.com/bored_link.cfm?link_ id=23846 but very few people would have asked questions at the time. Is the same happening now? (I knew I should have gone with "many respected organisations supported the Nazi party"!)
As for how many years the records run for, it's slightly irrelevant - we still don't know how our records compare to what would naturally occur if there were no civilisation.