An interesting question. With many things we have to balance the fun of the moment with the long term consequences, even with plain food. But with smoking, especially cigarettes, this is a quite one-sided balance. Even without the risk of cancer, every single cigarette will do considerable, irrevocable harm to your lungs. And I know few people wo smoke lightly, Nikotin is extremely addictive. Finally, there is the impact on other people, if one smokes in their presence.