New to board and seeking info

I have been looking to purchase shares in a company that will grow, standardize and sell cannabis. My search has lead me here. I am happy to be here and is it is time for me to broaden my investment in cannabis. Is there such a thing as an index, mutual or exchange traded fund got the MJ sector? I know this sector will fly and I am not going to have my entire life invested in one or two companies. Any help?