Caffeine has long been the most widely consumed psychoactive substance on the planet – unsurprisingly so, given that it’s found in everything delicious and good in this world (including chocolate, Coke Zero, matcha lattes and Lemsip Max). Not to mention coffee, which has never been more popular: both globally and in the UK, the coffee industry is bigger than ever and continues to expand at a head-spinning rate, with Brits