Tobacco causes about 40,000 deaths per year in Spain and can lead to illnesses like lung cancer, heart attacks, and coughing. It is forbidden to smoke in schools, hospitals, and other enclosed public places to protect non-smokers from secondhand smoke. Alcohol limits brain functions and can damage the nervous system and memory. Drugs like cannabis can impair concentration, memory, and coordination when smoked. Obesity is defined as excessive fat accumulation and poses health risks like heart disease, diabetes, and cancer. Factors driving increased obesity rates include diets high in calories and sugars with lack of nutrients, and more sedentary lifestyles.