Sometimes, Smok just sends out bad batches.
It's entirely possible that you got one, OR that they're counterfeit, I couldn't say. But good luck, I might try another vendor, and I'm not sure if this smok tank is one of the ones that has an RBA deck (I don't do smok) but you may want to look into that if you feel courageous, and etc.
If not, well the Crown Uwell (original) seems to get some mad love from its users, it takes drop in coils of a variety of sorts. I don't sub0hm myself so I can't say much more than that.
Good luck though.
Anna