Here is a plot for an adult novel that could teach society about the effects of cannabis:

The novel follows the story of a young woman named Sarah who is struggling with anxiety and depression. She has tried traditional therapy and medication, but nothing has seemed to help. One day, she meets a friend who tells her about the benefits of cannabis for treating mental health conditions. Sarah is hesitant at first, but she eventually decides to give it a try.

Sarah is surprised to find that cannabis actually helps her to feel better. She is able to relax and de-stress, and she has fewer anxiety attacks. She also starts to feel more creative and productive. Sarah is so impressed with the effects of cannabis that she decides to start a blog about her experiences.

Sarah’s blog becomes very popular, and she starts to receive emails from people all over the world who are also struggling with mental health conditions. Sarah shares her story and advice with her readers, and she helps to destigmatize cannabis as a treatment for mental health.

The novel ends with Sarah speaking at a conference about the benefits of cannabis for mental health. She is an inspiration to her audience, and she helps to change the way that society views cannabis.

This novel could teach society about the effects of cannabis in a number of ways. First, it could show how cannabis can be a safe and effective treatment for mental health conditions. Second, it could challenge the stigma that is often associated with cannabis use. Third, it could inspire people to seek out alternative treatments for mental health conditions.

The novel could also be used as a tool for education and advocacy. It could be used to teach people about the science of cannabis and its potential benefits. It could also be used to raise awareness of the need for more research on cannabis.

Overall, this novel could be a powerful tool for changing the way that society views cannabis. It could help to destigmatize cannabis use and make it more accessible to people who could benefit from it.