I heard that cannabis helps prevent such terrible diseases.

You are right, using the weed does prevent the development of cancer cells and reduce pain. In general, I am sure that many diseases develop against a background of stress, because stress greatly weakens the immune system. I encourage you to check out this website https://westcoastbud.io/products/edibles/ and buy yourself some delicious cannabis edibles like chocolate or gummies. From these products you will get double benefits in the form of pleasant taste and stress relief.