The document discusses several unhealthy habits including tobacco, alcohol, drugs, and obesity. It notes that tobacco causes about 40,000 deaths per year in Spain and leads to illnesses like cancer and heart attacks. Alcohol limits brain functions and causes memory loss and heart issues. Drugs like cannabis can cause concentration and memory problems as well as reduced coordination. Obesity, which affects over 1.6 billion people, is caused by an unhealthy diet and lack of exercise and increases the risk of diseases like heart disease, diabetes, and cancer.