This seems to be the overwhelming majority sentiment of the Internet or at least of what gets upvoted, but I think DARE at least worked on me. I wanna say it was probably 2nd grade, which would have been 1987 or 1988, and I don't remember the briefcase, but I do remember a plastic lung. It filled up and blackened with tar after only a few puffs from a cigarette and I remember being so viscerally disgusted and disturbed by that, I resolved to never smoke and I never did, in spite of a lot of peer pressure. I was largely friends with goths and art kids and nearly all of my friends smoked, some as early as 4th grade, but I never did.