In 1964, many people knew that there were serious health risks associated with smoking tobacco, but many people also kept smoking. Tobacco was so part and parcel of American life and culture that it basically made Jamestown a worthwhile colony, and cigarette and tobacco ads were everywhere, featuring celebrities and other notables promiting tobacco products. Yet through the 1950s and early 1960s, people became increasingly aware of a link between smoking and health problems such as bronchitis and lung cancer. Then Surgeon General Luther Terry led a committee on the links between smoking and health. Their report made larger claims about overall health being compromised by cigarette smoking, as well as simply being a large report from a public health official warning of the dangers of tobacco. This made smoking much less prevalent in American culture and a well known public health risk.