For weak lung qi, we can analyze the evidence by combining the four diagnoses of looking, smelling, inquiring and cutting, and give herbal tonics to regulate the lung, generally using Sheng Wei San and tonifying lung soup with addition and subtraction, which has the effect of tonifying the lung, benefiting qi and nourishing yin. We can also use American ginseng, Chinese wolfberry or Salvia miltiorrhiza and Astragalus, which can be taken with water as a tea substitute to benefit the qi and nourish the lung. You can also take the Chinese medicine Bailing Capsules orally, with the effect of tonifying lung qi and benefiting essence qi; Tonic Zhong Yi Qi Pills, with the effect of tonifying the middle and benefiting qi, raising yang and lifting traps; Ginseng and Atractylodes Granules, with the effect of tonifying the spleen and stomach and benefiting lung qi; Jin Shui Bao Capsules, with the effect of benefiting qi and nourishing yin, tonifying lung and benefiting kidney; Gui Shen Wan, with the effect of benefiting qi and nourishing blood, strengthening spleen and nourishing heart; Eleven Flavored Ginseng and Astragalus Tablets, with the effect of tonifying lung and nourishing blood, strengthening spleen and benefiting kidney. Normally, you can eat more foods that strengthen the spleen and benefit the qi, such as yam, snow pear, loquat, lily of the valley, Chen Pi, etc.