If you sell vapes online and ship to California, you're not off the hook just because you don't have a physical storefront. The FDA's PMTA process determines which products can legally be marketed. California adds its own licensing and flavor restrictions. Selling a product that isn't authorized—or that violates state rules—can lead to fines, seizure, and losing your ability to sell entirely. The good news is that most of the information you need is public. You just need a system for checking it.