Look at this series $2,1,,\large\frac{1}{2},\frac{1}{4}.....$ What number should come next?

Question

$\begin{array}{1 1} \large\frac{1}{3} \\ \large\frac{1}{8} \\ \large\frac{2}{8} \\ \large\frac{1}{6} \end{array}$