That is Tobacco, Marijuana, and Alcohol
Boredom.
Some of the leading causes of death are:diabetescancercar crashes
Tobacco use is the single leading preventable cause of death in the US.
Leading causes of mortality in the US include cardiovascular disease (heart attacks), vehicular accidents, domestic accidents, workplace accidents, natural causes (old age), and cancer.
Drug addiction destroys not only the abuser's life, but affects the rest of society, too. The rest of us pay in increased taxes as well more problems in the institutions that affect us and our children. Even if we could ignore drug addiction in our country, illegal drug use encourages the drug trade--and the resulting enforcement problems and government instability--in other countries
food
They do fail naturally but the some causes are engine overheating because of water pump failure, pressure problems in the head and water cooled oil coolers splitting and blocking the circulation leading us back to point 1.
eating, sleeping, and breathing
Um i imagine eating too much or interbreeding ?
The leading cause of death among young people in the U.S. is unintentional injuries, which include accidents such as car crashes, drug overdoses, and falls. In recent years, the rise in drug overdoses, particularly from opioids and synthetic substances, has significantly contributed to this statistic. Other notable causes include suicide and homicide, but unintentional injuries remain the predominant factor.
AIDS is not a leading cause of death in teens in the US, but it is one of the top causes of death in young adults. Accidents and homicides are top causes.
Cancer. Click on "Leading causes of death in America" under Related links below.