FDA doesn't apply in Canada.
E-cigarettes are covered in their aceptable use policy, according to paypal, they may classify them as a "drug", I haven't wasted my time reading it.
Feb 27, 2010: In accordance with PayPal's
User Agreement and
Acceptable Use Policy, we have closed your account. Your funds may be held for 180 days from the date of your last transaction. After 180 days, you will be able to access your funds by requesting an online bank transfer or, if applicable, a check from PayPal. Please update your address or bank information as we cannot be held responsible for checks issued to an incorrect address. We do ask that you please remove reference(s) to PayPal from your site.
I'm not sure what you are asking Paypal, but if you are using it for anything to do with e-cigs you risk loosing your money, and messing up your account and access to e-bay.