Study of 4,103 patients with positive test for coronavirus, looking at which are hospitalized. Being overweight is a huge risk factor, smoking again appears somewhat protective (odds ratio significantly < 1).
https://www.medrxiv.org/content/10.1101/2020.04.08.20057794v1.full.pdf

I'd be a little concerned that BMI ends up reversing ethnic/racial gradients of risk, due to differences in average BMI and bone density.