National Cannabis Industry Association | 67,727 followers on LinkedIn. The Voice of Main Street Cannabis. | Founded in 2010, NCIA is the oldest, largest, and most effective trade association serving the cannabis industry. Our membership is comprised of hundreds of small businesses and tens-of-thousands of cannabis professionals who know that we are stronger and more prosperous when we work together to lift up our entire industry. As the only national advocate for small cannabis businesses, NCIA works every day to advance policy reforms favorable to the whole industry — not just the wealthiest few.