Tobacco causes about 40,000 deaths per year in Spain and leads to illnesses like lung cancer, coughs, and heart attacks. It also damages non-smokers through secondhand smoke. Smoking is prohibited in schools, hospitals, and other enclosed public spaces. Alcohol limits brain and nervous system functions and can cause memory loss and heart disease. Drugs like cannabis are absorbed quickly through the lungs and brain and may cause problems with concentration, memory, and coordination as well as changes in hormones. Obesity is defined as excessive fat accumulation and poses health risks like cardiovascular disease, diabetes, osteoarthritis, and cancer. Main causes are poor diet with excess calories and sugars coupled with sedentary lifestyles.