Among the risk factors listed, the one you can control is: Your friends have recently started smoking.
While you may not be able to control the incidence of high blood pressure in your ethnic group or a family history of heart disease, you can make decisions about your social interactions and influence your friends' choices regarding smoking. Additionally, you can choose to avoid smoking yourself. Unintentional accidents are typically not within your control, but you can take steps to minimize risk (e.g., being cautious and aware).