I was of the understanding that you have to be pretty desperate to abuse buproprion. Isn't it the prison version of cocaine?
ALso, IIRC, buproprion taken orally mainly acts as a prodrug for the cyclized "hydroxybuproprion" - really a phenmetrazine-related morpholine -
radafaxine. (shame it isn't reduced futher to the "proper" phenmetrazine analog!) Said morpholine is mostly a NRI in comparison to its parent drug, which when you add in the slow diffusion through body leading to lack of "peak-like" brain concentrations with oral usage, means it's probably what you can blame for buproprion being generally regarded as way less euphoric/abusable than methcathinone.
Wiki sez rats and monkeys will self-administer buproprion IV, and Russia bans the stuff as a stimulant. And I know there's plenty of accounts of people abusing it insufflation, I'm pretty sure the consensus is it's too hard on the nasal soft tissue to be worth the returns for euphoria. I can't imagine it does good things to your blood pressure - the numbness is probably from elevated BP/vasoconstriction rather than any sodium channel blocking activities.
Oh, also,
buproprion elevates the risk of seizure, (especially at high doses/peak serum concentrations) Clarke's says theraeutic ranges for buproprion are 25 - 100 ug/L, levels above 170 ug/L are "associated with seizures", 450 ug/L "potentially lethal". Now, mind you, the same reference says the peak blood concentrations for a 200mg oral dose can vary from 120 to almost 400 ug/L, so I think this is the most conservative estimate you could get. But, y'know, safety first.
TL;DR: I wouldn't bother destroying your sinuses, there's better things to do with your time.