First, mate is not (supposedly) addictive. Yes, it does contain caffeine, but not only is there less caffeine in a cup of mate than in a cup of green tea, but the caffeine in mate is paired with different chemicals than in most caffeinated drinks, rendering mate non-addictive.
Sources for this info:
(can't link due to low # of posts)
I know you can't always trust the internet, so take what I'm saying with a grain of salt. So I think that you could be addicted, and I wouldn't doubt it if you're consuming 1kg/month like the chap above. That said, there are far worse things to be addicted to than mate
, plus it takes large amounts to be addicted in the first place.