Chocolate's been around for a heck lot of time - and people have been addicted to it for a heck lot of time too. In the 18th century, at least not until the end of it, chocolate was a liquid drink, and of course, chocolate tablets did not exist. As a fan of chocolate I'll try to leave occasionally some paintings and historical facts about the "food of gods".
Fact 1: Murders! Chocolate was just the perfect beverage to use as a weapon! It was dark and the taste was strong, so you could not detect easily any poison in it. The number of victims is not small. I for myself think it's a good way to go. One example: once, a nobleman that dedicated himself to the tasting and improvement of chocolate ditched a lady, that planned a sweet revenge. She invited him over to her place and served him a delicious looking hot chocolate - with delicious poison. He drank it all, and the poison acted quickly. Before he died, he called his murderer and his epic last words were: "The chocolate would have tasted better if you had put some sugar in it - poison makes it sour!". Perhaps he knew from the beginning that it was poisoned - but what chocolate lover in his or her healthy mental state would waste a cup of chocolate?
A Lady pouring Chocolate ('La Chocolatière')
about 1744, Jean-Étienne Liotard