Thin in Europe...

So I was sitting on the beach in Tahoe for the past few days watching the kiddos play in the water and reading "What Would Audrey Do?"  Although my husband would never be caught DEAD reading such a book, he DOES occasionally look over my shoulder.  I said, "Wow, Audrey Hepburn was 5'7" and weighed 110 lbs. for most of her life."  He said, "Yeah.... but she SMOKED 3 packs a day!" .... This brought up an interesting arguement ..... Admittedly, Americans are fatter than our European counterparts.... BUT we smoke less..... a coincidence?