I handed mine to the guy at passport control, who gave me a look that said "what am I supposed to do with this?". I assumed that they would be collected at customs, but nobody stopped me when I went through the green line (no fever to declare?). So now I have a filled-in copy of the form at home - I doubt this will be particularly effective against the flu.
Duty Free IF You Buy One Course. Duty Payable IF You Don't Buy. Diversity is the key to economic and political evolution.
It was a silly form. When asked where in Spain I was staying I wrote "We're just passing through on our way to Portugal" - I was tempted to add "so don't worry about my cough" but was already worried about catching the connection to Lisboa.
We handed them to an Iberia crew member when we got off the plane, who looked like she was just going to drop them on some desk somewhere. Seemed a mostly pointless exercise. And the world will live as one