Using a credit card is no longer proof that you're over 18. Look how many debit cards are issued on Visa or MasterCard. I foresee many vendors requiring a signature and proof of identify upon receipt of your package. In other words, if you aren't home when it's delivered, you're going to truck on down to the post office to pick it up.
At least one Cali vendor already requires this. I have no problem signing for a package! Things ARE going to change. I will be thrilled if this is the worst inconvenience that happens to vaping.