You really do not understand CC procedures do you.
Stores do Not give VISA/etc. Discounts. Stores are Charged a Percentage of each and every purchase plus a processing fee on every CC transaction they accept.
Stores would love nothing more than a way to close the transaction additional Fee Free - then they could reduce artificially high pricing without incurring loss.
As an ex-small business owner I assure you this is correct and the smaller the business the higher the fees.
Paypal Debit Master card - works like a CC or a DC, but is a DC and adds a layer of protection. Fast email notifications of all activity.
And YES, it can be used all day long to make e-cig purchases.