There's no scientific evidence that G.M.Os harm humans. Quite the contrary The health benefits of G.M.Os, in terms of food security, better diet and nutrition will be overwhelmingly positive.
Quotes about gmos (3 Quotes)
The other major problem with introducing GMOs is gene flow. This is as significant as buildup of resistance, probably more significant.
Most G.M.Os undergo rigorous lab testing to check human and animal tolerance. If something is found to cause an adverse reaction, it is not put on sale, it's as simple as that. Conventional crops don't have that advantage.