disease of the lung and its sequelae, including respiratory and pulmonary impairments, arising out of coal mine employment.” 30 U.S.C. § 902(b); 20 C.F.R. § 725.101(a)(20). The “legal” definition of pneumoconiosis (i.e. any lung disease that is significantly related to, or substantially aggravated by, dust exposure in coal mine employment) is much broader than the medical definition, which only encompasses lung diseases caused by fibrotic reaction of lung tissue to inhaled dust. See Doris Coal Co. v. Director, OWCP, 938 F.2d 492, 496 (4th Cir.1991). Congress granted the Secretary of Labor broad authority to promulgate regulations under the BLBA. 30 U.S.C. §§ 932(a), 936(a); 20 C.F.R. § 725.301-.422; see also Director, OWCP v. National Mines Corp., 554 F.2d 1267, 1275 (4th Cir.1977) (<HOLDING>) (quoting Mourning v. Family Publications
holding that although the first amendment was implicated the regulation compelling disclosure of certain information in advertisements was constitutional as long as it was reasonably related to the states interest holding that validity of regulations will be sustained as long as  reasonably related to the purposes of the enabling legislation  holding that prison administration may infringe upon prisoners first amendment rights as long as the infringement is reasonably related to legitimate penological interest holding that the trial courts classification of property will not be disturbed as long as there is competent evidence to support that determination holding that regarded as claim was reasonably related to claim of discrimination on the basis of disability