The rice we refers here to is the rice at field (brown rice or rough rice), 
not yet manufactured, brown colored and protected by the hard shells which 
will be removed after the next operations. The italian term is "risone" 
(large rice).


Some years ago, I thought to illustrate to my students the dependence and
independence of statistical variables through the example of a relationship
between the yearly rice production in China and the grams of tobacco smoked
at the "Pipe Slow-Smoke World Championship". 

I never have been able to find the relative data and so confirm an assumed
correlation.

Here I've found the rough-rice ten best and worse producer countries 
and the first ten classified smokers at the "16th World Cup in Pipesmoking
for Team"  held in Monastier (Treviso, Italy) on October 18, 2015.
I learned that in such a championship the tobacco is fixed to 3 grams
and the duration of the smoking (with only max two ignitions within the
first minute) is measured. As you can see from the data, the winner smoked
through 3h:10m:25s with 3 grams of tobacco!

And the two variables are correlated, also if they are fully independent.
__________________________________________________________________________
Rice production data taken from
http://www.colturaecultura.it/content/riso-nel-mondo
(page 612;visited March 28, 2016).

Data on "Slow-Smoke"  Championship taken from
http://www.pipeworldcup2015.it/it/classifiche-2/
(click on "Classifica mondiale assoluti pdf" ; visited March 27, 2016) 
-----------
2019 slow-smoke world champioship
https://www.pipaclubitalia.org/classifiche/  (23.3.2022)
2019 Slow-Smoke world club championship - Leopoli (UA) - October13, 2019

_________________________________________________________________________
fz March 29, 2016. Updated March 23, 2022