The thing with second hand smoke is your senses can warn you of this danger before it's a threat.
You can often see someone smoking before you can smell the smoke. You can also smell the smoke if you happen to not see them and then choose to react to the situation. You can either continue inhaling that smoke or walk about 30 feet in any direction away from the source to put yourself out of danger.
But with this virus, you don't have such luxuries. It's invisible, tasteless, odorless and can kill you after being exposed to it once. That's pretty much as scary as it gets.
you need to be exposed to second hand smoke for long periods of time before it can kill you, the covid-19 exposure take considerably less time in comparison, then again are they really comparable at this point?
somewhere between 2.2~(3 | 4 ?), one thing though, unlike SARS, WARS(nCoV) is already contagious during incubation period(14 days) and even before any symptoms cough/fever shows up, this SUPER complicates any measure to quarantine it
Just a heads-up, the WHO discourages geographic labels for diseases. Those labels may be totally orthogonal to the disease itself (as is the case with Spanish Flu), they punish localities for outbreak of (or association with) disease, and the fear of stigma could impact local officials' decisions about reporting outbreaks and seeking help from disease experts.
short answer is we have to wait for "28 days later", the long answer is... complicated, please take this with a grain of salt
the first tide of WARS(nCoV) "Contagion" have either become ill(hospitalized and quarantined) or dead, so now we're waiting to see if the number of cases outside of China still climbs as a local transmission epidemic
If this tide continues, international country like eg Singapore can super-spread this into global pandemic like H1N1 unless we close off borders and ban all flights/shippings economics/travels...
How viable is such containment actually remains to be seen, lets pray for the best
I'm not sure anybody wanted to be "that guy" who defy "that rule" and gets incarcerated or branded as "Liar" like those 8 other whistle blower doctors... history can always be nicely rewritten since ancient times in China
