I feel as far as tobacco use and the patch that most (in general good health), would be fine. Many doctors are now taking this stance of acceptable combined use (if necessary), as a harm reduction strategy (my own included).
But, with using the e-cig or PV you already have the option to increase or lower your intake of nic levels that you'd require, so it kind of defeats the purpose to slapping on a nic patch (not to mention paying, if you do, their ridiculous price, let alone that it's a Big Pharma product that I just REFUSE to participate in purchasing/using when their ARE natural alternatives worth investigating regarding ANY pharmaceutical drugs).
Just my 2c....
VapeOn,
Greg