In this work, we use the C3P0 model to calculate the decay widths of the low lying charmonium JPC=1−− states, nominally J/ψ(1S) and ψ(2S), in the following common channels: ρπ, ωη, ωη′, K∗+K−, K∗0K¯0, ϕη, ϕη′.