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This is kind of a broad question, but I think you should examine what people said about coffee in the early history of the beverage.
"...it drove away fatigue and lethargy, and brought to the body a certain sprightliness and vigour."
--Abd al-Qadir al-Jaziri, 1587, quoted in The World of Caffeine by Bennett Alan Weinberg, Bonnie K. Bealer.
"A beverage as black as ink, useful against numerous illnesses, particularly those of the stomach."
βLΓ©onard Rauwolf, Reise in die MorgenlΓ€nder, 1583, quoted in Wikipedia.
"That which makes for its coldnesse is its stipticknesse. In summer it is by experience found to conduce to the drying of rheumes, and flegmatick coughes and distillations, and the opening of obstructions, and the provocation of urin. It is now known by the name of Kohwah. When it is dried and thoroughly boyled, it allayes the ebullition of the blood, is good against the small poxe and measles, the bloudy pimples; yet causeth vertiginous headheach, and maketh lean much, occasioneth waking, and the Emrods, and asswageth lust, and sometimes breeds melancholly."
--Dr. Edward Pocoke, The Nature of the Drink Kauhi, or Coffee, and the Berry of which it is Made, Described by an Arabian Phisitian, 1659. Quoted in All About Coffee by William H. Ukers, 1922.
The following are also quoted in All About Coffee:
"this drinke they take every morning fasting in their chambers, out of an earthen pot, being verie hote, as we doe here drinke aquacomposita[49] in the morning: and they say that it strengtheneth and maketh them warme, breaketh wind, and openeth any stopping."
-- Bernard Ten Broeke Paludanus, 1590s
"...Drinking a certaine liquor, which they do call Coffe, which is made of seede much like mustard seede, which will soone intoxicate the braine like our Metheglin."
-- William Parry, 1601
Oh, what the heck, here's a collection of the claims made about coffee around that time, from All About Coffee:
So the point here is that you had a lot of people spreading the word about coffee -- suggesting that it drives away fatigue, but also that it had medical benefits. It's a stimulant, and people tend to like stimulants, and this one has a fairly pleasant smell when prepared -- I think word of mouth was probably enough to expand its popularity.
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I found the following moment interesting regarding the coffee adoption. The coffee could have been excommunicated from Catholicism but was saved by Pope Clement VIII (1535-1605) and declared as a truly Christian beverage. (Click the quote to see the context of the citation)
by Ukers, William H. (William Harrison), All About Coffee, Gutenberg Edition
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I think it's more a question of biology than history. Coffee:
A substance with those features seems destined for popularity.