In general, mangas don't typically have fillers. They tend to have a more focused narrative without unnecessary additions to stretch the plot. But there can be exceptions depending on the author's style and the publishing requirements.
Yes, smoking weed can have many negative impacts. It can affect your physical health, like causing problems with your lungs and heart. Mentally, it can make you less focused and motivated, which might lead to poor performance in school or at work. And it can also damage your relationships as your behavior might change in a way that others don't like.
Not at all. Romance novels are a way for people to escape and enjoy a fantasy. Marriages are ruined by real issues like communication breakdown, lack of trust, and incompatible values, not by novels.