When you look at it in that way, as people harming themselves even though they are told better and shown the consequences, you better be ready for a long list:
Tobacco (cigarettes and smokeless) Alcohol (beer, wine and hard liquor) Fast Food (and ALL that includes) Red Meat (cholesterol) Chicken (laced with antibiotics and steroids) Milk (laced with antibiotics and steroids) Fruits and Vegetables (smothered in pesticides) Soda (regular, sugar) Diet Soda (artificial sweeteners) Fructose Corn Syrup (easier to list what it's NOT in, that what does contain it) A multitude of cleaners and household products with chemicals A plethora of medications (prescribed and OTC) Race Car Driving Downhill Skiing Fencing Bungee Jumping....well you get the idea, just sayin'.