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If you're concerned about COVID-19 - get vaccinated for the flu (dangerous itself + the two can co-occur) - quit smoking, use patch/gum if need be - thoroughly wash/sanitize hands throughout the day; avoid public door knobs, touchscreens, etc - practice not touching your face
With serious outbreaks in South Korea, Iran & Italy, it's likely the "narrowing window" for global containment has closed. If you're age >50 or live with someone >50, esp near a major metro area, you should seriously consider lifestyle changes to minimize risk assuming exposure
If you're >50 years of age + in poor health, make a plan for reducing risk of exposure within your existing routine and, if possible, tackle existing risks that increase your reliance on the medical system. Assume that a global pandemic may overwhelm the medical infrastructure
At the risk of sounding alarmist but in the interest of honesty, I do think it wise to sharply limit plans for air travel and large public gatherings, and to (more or less) limit smaller gatherings and visits to public spaces. Get supplies for managing illness/holing up at home
If there's anything you'd need to manage 2-3 weeks very sick at home, assume that it may not be available when you need it and put a kit together now. If there are friends or family members who regularly rely on you, also account for them
Trump really could not do anything to stop this though.
The virus primarily damages your lungs, i guess smoking is a further complicating factor in any pneumonia
I caught touching my lips as reading this 
I think some preparations for a prolonged stay at home will be helpful too.
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