If only It worked like that and was that simple. Just because it's sourced from nature doesn't mean it's good for you with the dosages recreational smokers take and the methods they take it.
Ancient human populations have gone extinct since the dawn of mankind. Now was there this advanced civilization that has been wiped out, depends what you mean by advanced, certainly nothing close to being as advanced as today.
Very similar rate to mine, but I get a £2ph uplift on nights and get around £380 for a Saturday night shift.
When I'm on days I finish at 2-2:30, on nights it's job and knock, can't stand the shift though.