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The Nicotine and Cannabis Policy Center at UC Merced highlights evidence about COVID-19, tobacco and vaping, including risks to children exposed to secondhand smoke, finding that Kids exposed to secondhand smoke have weakened immune systems and higher chances of complications from pneumonia. Since COVID-19 attacks the respiratory system, it is critical to prevent exposure to anything that would weaken the lungs

10.1021/jf1010897 J

10.1016/S0026-0495(97)90018-4 Shennan NM, Seed M, Wynn V: Variation in serum lipid and lipoprotein levels associated with changes in smoking behaviour in non-obese Caucasian males

The second is firmer but has a soft spot around the midpoint that catches my attention