as unethical as working for tobacco companies.
They have a long history of malicious behavior, but it is not, on the face of it, wrong to take such a job.
But I still might avoid it, myself. Once bitten, twice shy. You spend fifty years conspiring to conceal damages to your own customers and maybe I prefer not to work for you even after you stop doing it
Yes, working for an industry that does harm to people is unethical. However, the censure that is deserved is proportional to the the "status" of the position they occupy in the industry, e.g. CEOs > Professionals > Blue Collar > Part Timers. Its not just the influence the different people have on the industries or companies they work in, its also a function of their autonomy. A lot of people have little choice but to take whatever job they can get, because they have other obligations as well: to their selves, to their families, and to their communities.
I find that figure incredibly dubious considering that tobacco requires years of chronic use before it kills you, and it typically doesn't kill you in a way that is entirely attributable to that single cause.