Legal, World's Most Popular Drug
This page is the CodyCross answer for the clue below from Under the sea, Group 32, Puzzle 3.
Question is: Legal, World's Most Popular Drug
and the answer is: CAFFEINE
Word Meaning:
CAFFEINE — An alkaloid, C₈H₁₀N₄O₂, found naturally in tea and coffee plants, which acts as a mild stimulant on the central nervous system.
Definitions from Wiktionary.