The marijuana industry is taking America by storm, and this is only the tip of the iceberg. By the end of 2016, as many as 20 states could have legalized marijuana. Those reforms will create numerous business opportunities for entrepreneurs. Below is a video of investors gathering at the ArcView Group's "Arc Tank" event in San Francisco to hear pitches from cannabis-related companies seeking funding. The video was put together by Forbes magazine. It wasn't that long ago that a media outlet like Forbes would have never considered covering a marijuana industry event. I'm happy to see that times have changed: