An unrealistic smoking ban
The few studies that have been done on multi-unit housing where smoking has been banned show that the majority of tenants who smoke ignore the prohibitions. The cost of enforcing an all-out smoking ban likely would be quite high, and higher still if it were expanded to include less-dangerous nicotine products such as chewing tobacco and e-cigarettes.
In the context of a sustained effort to encourage smokers to quit or, at least, switch to safer forms of nicotine, a ban might be possible. As a free-standing effort, however, it seems almost certain to fail.