▁my oc ard ial ▁inf ar ction . ▁In ▁adult s ▁who ▁go ▁to ▁the ▁emer gency ▁department ▁with ▁an ▁unclear ▁cause ▁of ▁pain , ▁about ▁ 3 0 % ▁have ▁pain ▁due ▁to ▁coron ary ▁ar tery ▁disease . ▁ ▁R isk ▁factors ▁Cor on ary ▁ar tery ▁disease ▁has ▁a ▁number ▁of ▁well ▁determined ▁risk ▁factors . ▁These ▁include ▁high ▁blood ▁pressure , ▁sm oking , ▁di ab etes , ▁lack ▁of ▁exercise , ▁ob es ity , ▁high ▁blood ▁ch ol ester ol , ▁poor ▁di et , ▁de pression , ▁family ▁history , ▁and ▁excess ive ▁alco hol . ▁About ▁half ▁of ▁cases ▁are ▁linked ▁to ▁gen et ics . ▁Sm oking ▁and ▁ob es ity ▁are ▁associated ▁with ▁about ▁ 3 6 % ▁and ▁ 2 0 % ▁of ▁cases , ▁respectively . ▁Sm oking ▁just ▁one ▁cig aret te ▁per ▁day ▁about ▁doubles ▁the ▁risk ▁of ▁C AD . ▁L ack ▁of ▁exercise ▁has ▁been ▁linked ▁to ▁ 7 – 1 2 % ▁of ▁cases . ▁Ex pos ure ▁to ▁the ▁her b ic ide ▁Agent ▁Orange ▁may ▁increase ▁risk . ▁R he um at olog ic ▁dise ases ▁such ▁as ▁r he um ato id ▁ar th rit is , ▁system ic ▁l up us ▁er yth em atos us , ▁ps or ias is , ▁and ▁ps ori atic ▁ar th rit is ▁are ▁independent ▁risk ▁factors ▁as ▁well . ▁ ▁Job ▁stress ▁appears ▁to ▁play ▁a ▁minor ▁role ▁account ing ▁for ▁about ▁ 3