Maybe he got too stressed out from all the responsibility of being a hero. The pressure of protecting the village and his friends could have pushed him to pick up smoking as a way to relieve stress.
In the 'naruto is a smoker fanfic', Naruto could start smoking due to a combination of factors. One possible reason is peer pressure. If he hung out with a group of ninjas who smoked, he might feel pressured to join in to fit in. Also, the trauma he has experienced throughout his life, such as the loss of his parents and the hardships he faced growing up, could lead him to use smoking as a form of self - medication. Additionally, he might see smoking as a way to look more mature and tough, especially in a ninja world where appearance and reputation matter a great deal.
Maybe he saw someone he respected smoking a pipe and thought it looked cool, so he decided to try it.
Maybe it's to show his maturity or a way to cope with the difficult situations he faces in the fanfic world. Smoking is sometimes used in literature as a symbol of stress relief or a sign of a character going through a tough time.
There are several possible reasons. For one, it could be a way to subvert the expectations of the Naruto character. In the original series, he's so pure and full of life. By having him smoke in fanfiction, writers can create a contrast. It might also be used to set a certain mood, like a gritty or more adult - oriented atmosphere. Additionally, it could be a symbol of his rebellion or a sign of him breaking away from the norms of his ninja village. Writers might use it to explore a different side of Naruto that wasn't shown in the original story.
Perhaps the writer wants to create a more 'adult' or 'mature' version of Naruto. By having him smoke, it gives an impression of a character who has seen a lot and is dealing with his problems in a less - than - ideal way. It could also be a way to shock the readers and make them see Naruto in a completely new light.
One reason could be to show a darker or more mature side of Naruto. Maybe in a 'what - if' scenario where he has faced a lot of hardships and turned to smoking as a way to cope. Another reason might be for comical effect, like a really absurd or out - of - character situation that's meant to be funny.
One possible reason could be peer pressure. If her friends smoke, she might feel pressured to fit in. For example, in a school setting where a group of 'cool' kids smoke, she may start just to be part of the group.
Well, if Naruto smoked, it might slow him down. Smoking is bad for the lungs and he needs good lungs for all that running and fighting in his ninja life. He might not be able to perform jutsus as well or keep up with his friends during missions.
One reason could be to show his maturity. Smoking is sometimes associated with adulthood or a more worldly view. So, by having Naruto smoke, the author might be trying to show that he has grown up and is dealing with more complex issues.
Poison or some sort of harmful jutsu effect. Maybe an enemy uses a special poison or a jutsu that slowly weakens Naruto's body. In the fanfic, this could be a new and unique type of attack that he has not encountered before, and his body is not able to withstand it, resulting in fainting.
One reason could be curiosity. Naruto might be curious to see how fans imagine different scenarios in the Naruto Shippuden universe. Maybe he wants to see how others view his friends and his own adventures.