I just reviewed the Logic Disposable last night, and while I initially said the flavor didn't seem contaminated to my taste buds, I did notice that it seemed to give off a very polyfil taste very quickly.
I'm vaping on the Imperial Hookah tonight and it's performing a lot cleaner.
Overall, I have indeed had some odd experiences with disposables at times - I do believe I've had the numbing effect before over the years. Personally, if it's overwhelming, I wouldn't really vape it - it might be a reaction with some metallic particles coming off the coil or so, and if I remember right, the numbing I had once from some random disposable did taste metallic.
I've even had a disposable that gave me a week long, agonizing throat infection - the doctors couldn't even identify what was causing it as it wasn't viral born (as I didn't tell them I had vaped). Maybe Logic has good customer service, I'm fixing to call them tomorrow and ask if they want to do anything about the disposable of mine that went polyfil on me about after 30 or 35 puffs.