While the quantity of cocaine in a glass of Coke was insufficient to have an impact on the drinker, its removal from the Coke recipe was certainly the result of fears about cocaine addiction. There is no doubt much more to be said, but, while you are waiting for fresh responses to your query, you might like to review this earlier thread, led by /u/SnowblindAlbino, which reviews the history of the removal of the ingredient from the drink.