What Blackbeans said, only you can scale it down to see that it works at a low level. Take cannabis (or whatever niche) keywords for your site or blog, go to Google News, and do a search for those terms tied to a news story or trend. You'll get a list of recent stories that can serve as the basis for creating your own blog entry or guest post. The title should be about that news item.
As a guest post, you can even find some cheap gig seller who will publish it on a decent looking d0-follow site with good metrics. Now you have an url that directly links to your site, that isn't associated with a no-no topic, that you can use as THE url to use in getting d0-follow editorial level links to that news story. In other words, if your niche is peanut butter but it's 'forbidden,' create content about peanut butter and jelly on a big boy domain, that points to your peanut butter niche.