Im sure this is correct, its easy and dont worry about the 'a7' and 'd7's, 
although it is more effective with them, it is still  right if you just play plain 'a' and 'd'
***ENJOY***

-no capo-

VERSE
     G                               C         A7
Blue smoke goes drifting by into the deep blue sky
    D               D7           G    D7
And when I think of home I sadly sigh
   G                               C
Oh I can see you there with loving tears in your eyes
D            D7            G        G7
As we fondly said our last goodbyes.

CHORUS
    C                       G
And as I sailed away with a longing to stay
  A7                          D         D7
I promised I'd be true and to love only you
     G                   C            A7
Blue smoke goes drifting by into the deep blue sky
   D           D7              G   D7
My memories of home will never die.