are there long-term studies on glyphosate safety?

In 2018, the National Cancer Institute (NCI)-supported Agriculture Health Study (AHS) released a publication that found no association between glyphosate-based herbicides and non-Hodgkin lymphoma (NHL) in real-world use. The AHS is an ongoing study that has followed over 50,000 pesticide applicators for more than 20 years. 

This study is one of thousands that concluded glyphosate is safe to use as directed.