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This reminds me of when I was at the height of my religious fervour and attending the most bizzare pentecostal church imagineable (including animal noises and women re-enacting labour and childbirth). I was never that much into it and it wasn't long before I realised it was all preposterous, but to do my duty as good happy clappy person I was forced to take two double espressos before the Sunday service. Its interesting how many churches these days involve coffee in their evangelism work so maybe I was just setting a trend with my use of mind altering substances.
So is the coffee culture a social habit or a clinical addiction? I think that, like the coffee of the 1970's, its half and half. Some people like to watch the world go by and some like to be seen. According to an architect friend this is why coffee shops all have big windows. To some it will be a true substance addiction, but I have yet to see mid afternoon queues at Tesco for pro-plus tablets.