You should tell your wife to read the bible.
In it, it talks about how all the herb on the earth was given for mankind to use and enjoy. It even prophecises how marijuana will become banned. But obviously these "convenient christians" will gloss over things like this. And the fact that the bible is strictly against being drunk off wine/liquor just shows how much hypocritical our christian society is because we all know how "christians" love to drink

My advice to you is to work it out with her. Conflicts make relationships stronger in the long run. Dont be weak and quit. And read the bible more, because basically every problem youll ever have has been a subject in the bible.
As for your sexual life, my advice to you is to stay away from the porn. But what does help are books that give you advice of how to make the experience more pleasurable. Sex is a BIG part of marriage. A healthy sex life will make you and your wive's life much better

Hopefully she will see the truth in marijuana and you all may be able to share this wonderful experience together