Oder adults with a poor sense of smell were twice as likely to develop coronary heart disease within 4 years https://jamanetwork.com/journals/jamaotolaryngology/article-abstract/2840475 The olfactory system shares some neurological pathways with parts of the brain that control cardiovascular function https://conexiant.com/otolaryngology/articles/is-loss-of-smell-more-than-it-seems/