I’ve always been skeptical about caffeine’s alleged physical dependence. I’m a two or three cups a day consumer, but I’ve quit many times and never felt any different. This has been entirely by accident, like forgetting to pack coffee on a 2 week back packing trip, or purchasing decaf coffee by mistake, and didn’t even realize I wasn’t drinking for several days

If a drug is compatible with a healthy social or productive lifestyle it would seem unreasonable to ban it. Danger of withdrawals might be a consideration.

Caffeine is pretty safe. The withdrawals, for those of us who experience them, are safe if unpleasant.

There's prescription drugs that cause dependency but are widely prescribed. Gabapentin is a good example?

Alcohol is the drug that best fits the "grandfathered" idea, since it's for many folks not compatible with a healthy lifestyle and the withdrawals can be fatal. Alcohol is impossible to ban, though, because the precursors are in every grocery store on the planet and grow on trees

Caffeine withdrawal symptoms don't last more than 1-2 weeks. And we're talking about headaches, feeling sluggish... not dying, like other drugs.