71.   As with tobacco smoke, marijuana smoke poses proven threats to lungs, heart, immunity and reproduction.

72.   Assuming terrorists have the smallpox virus, or could buy or steal it, could it pose a threat?

73.   Astronomers say these discoveries underscore the need for a greater worldwide observing effort to discover such objects long before they might pose a threat.

74.   At issue was not just who owned the fossil, but the broader question of whether the growing commercial appetite for such artifacts poses a threat to scientific research.

75.   At the end of the three-hour meeting, school officials told Hess that his action posed a threat to his fellow students.

76.   Atlanta played aggressively but was unable to organize its play and pose a threat.

77.   Before that, there had been no specific rules, but the inspection service could turn away any shipment thought to pose a threat.

78.   Besides swallowing cars and disrupting traffic, the aging water lines have a long-term economic effect and pose threats to public safety, Hillman says.

79.   Black leaders immediately denounced the shooting as indicative of a Police Department that too readily assumes that black people pose a threat.

80.   Both men feel their track competition has enhanced their physical health far more than it has posed any threat to it.