Smok doesn't consistently suck, but some setups do seem to have more problems than others. There are those that like them and use them consistently, but I'm not sure they are the best choice for a beginning vaper. There is too much risk of user error, they do offer a lot of options for the price point but sometimes something simpler is better to start out with. I'm more of a MTL (high resistance, inhale like inhaling like a cigarette, into mouth, then lungs, then out, rather than DL (inhale directly into the lungs, high volume of vapor, usually lower nic as more vapor is being inhaled.) I don't know exactly how much actual vaping you got to do, but if you were happy with the vapor you got, and like inhaling directly into your lungs, there are some good startout sub0hm setups besides smok, though you *may* pay slightly more, but not always. If you like the idea of less vapor, you may want to talk to the shop guy about a different setup, one with higher resistance coils (1.0 and above) and higher nicotine e-liquid to start with.
It really depends on your preference, but since you are returning the setup anyway, might want to think about how you liked the vapor production (if you got any at all) and if you did, staying in a similar resistance range for a coil/tank.
Good luck!
Anna