Venus also lacks water in its atmosphere. Under the influence of solar wind this may have been decomposed giving off hydrogen, which then went away into space.
The idea of solar wind stripping the atmosphere depends on the mass of the molecule/atom being stripped. Ionized hydrogen is photodissociated from water by solar wind and being light, it gets blasted away easily. The leftover oxygen from water combines with other partners over geologic time scales (silicates, carbonates, CO2, SO2 ect). So Venus is able to have a dense atmosphere, but solar wind stripping due to no magnetosphere is a major reason it's so uninhabitable today.
Old_C_Code
Jun 19, 2017Venus has no magnetic field, and a substantial atmosphere closer to the Sun. :/