The way this was written, it sounded like the drink was MADE with cyanide rather than tampered with.
Yeah, it's confusing. It says he "thought" the warning label was an advertising gimic. But it also says the drink is popular, so it's obviously not killing everyone.
Almost sounds like someone put cyanide in it AND a warning label on it. Maybe someone was trying to test it out to see how many people would drink it, anyway. (What a sicko).