What does L.S.M.F.T. mean and who created it?

LSMFT means Lucky Strike Means Fine Tobacco.

It was the creation of George Washington Hill, son of Buck Duke, founder of the American Tobacco Company.

The slogan, introduced in the early 1940s, became so popular that by 1944 its acronym, L.S.M.F.T., was printed on the bottom of every Lucky Strike package.