Dec 9 (Reuters) - British American Tobacco said on Tuesday it is on track to deliver its annual guidance and launched a fresh 1.3 billion-pound ($1.73 billion) share buyback, on the back of strong cigarette pricing in its biggest market, the U.S and growth in its tobacco alternative products.

($1 = 0.7502 pounds)

(Reporting by Yamini Kalia in Bengaluru; Editing by Sumana Nandy)