If you don't smoke, you might also want to discourage smokers, how do you do it? Well, telling them that smoking causes cancer may sound empty. Maybe you could try different tactics, you might warn girls about premature aging and boys about reduced stamina and sexual health. Perhaps talking about aging and sexual performance might hit them hard compared to talking about cancer. These days, people, mostly young people, are more likely to care about how their habits affect their looks and lifestyle than long-term health risks.