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 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.
Maybe he saw someone he respected smoking a pipe and thought it looked cool, so he decided to try it.
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.
Perhaps it's a symbol of his new - found independence. After leaving his family and then potentially coming back, he might be exploring new things. Smoking could be part of that exploration, something that he wouldn't have considered before. Also, it could be used to add an air of mystery or edginess to his character. Fanfiction writers often use such elements to make a familiar character seem more complex and interesting.
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.
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.
Stress is a major factor. In many smoking wife stories, the wife is often dealing with a lot of stress, like managing a household, taking care of children, and working at the same time. Smoking gives her a momentary break from all that pressure.
First, it's illegal to promote drug use in any form, and weed is an illegal drug in many places. Second, Naruto is a positive role model for many fans, especially young ones. Depicting him smoking weed goes against the positive values he represents like friendship and hard work. Third, it can have a negative impact on the Naruto fan community, making it seem like such inappropriate behavior is okay within the context of the story.