We can't stop illegal aliens from entering our country, but then again... do you really want to be dropped off in southern Canada or northern Mexico and risk getting shot just to see the Empire State Building? The stages of getting your visa and passport are the times in which you'll ever be questioned about your history. If you get those two documents, you're good.

It doesn't matter, anyways, because I'm pretty sure your dad is just trying to scare you away from smoking in the first place.