Owing to the injection of gas into the LHC beampipe while multi-TeV proton or ion beams are circulating, the LHCb spectrometer has the unique capability to function as the as-of-today highest-energy fixed-target experiment. The resulting beam-gas collisions cover an unexplored energy range that is larger than previous fixed-target experiments, but below RHIC or LHC collider energies. Here we present recent studies of hadron production and polarization from beam-gas fixed-target collisions at LHCb. The upgrade of the fixed-target system, named SMOG2, and the preliminary results from the first collected data are also discussed.