I wouldn't have voted for it either, based on the following.
http://www.commondreams.org/views/2015/11/04/defeat-marijuana-legalization-ohio-says-lot-about-kind-economy-people-are-sick-and
Leaving aside heated rhetoric about the evils of Big Pot, the fact is that, had Issue 3 passed, it would have established a system of elite and most likely absentee ownership, as opposed to community-based family businesses. Voters recognized the need for local, broad-based ownership as the foundation of a thriving, resilient economy.
Issue 3 was created by a decision-making process led by private interests, excluding local residents. Voters sent a message that they want more voices at the table.
While much was said about the jobs a new legalized marijuana industry would create, there was no guarantee that those jobs would offer decent wages or dependable employment. There was a clear preference for a business model that offers inclusive, living wage jobs that help families from all walks of life enjoy economic security.
Finally, under Issue 3 the business of marijuana would have been the business as usual of wealth inequality. Resentment on this point was pervasive, particularly because there is such a culture of entrepreneurialism and private growth, created by marijuanas longtime illegal status.