 What most experts will say, and it's an important point, is actually we know quite a lot about the safety of these drugs because type 2 diabetics have been taking them for 18 years. And I'm putting it a bit more crudely than they would, but if the drugs made you grow horns, the diabetics would have horns by now, right? Yet these drugs do present potential risks for pancreatitis, thyroid cancer and other conditions. But the greatest concern researchers have, and the one that worried Hari the most, is that no one knows the long-term effects of taking these drugs for decades.