I often catch a cold after quitting smoking and drinking.

This is a normal phenomenon. After quitting smoking and drinking, the patient's body is in a period of adjustment. In the past, the spirit was supported by the toxicity of alcohol and tobacco. Now that you're gone, your body should get used to it. After a while, it will get better. We often encounter this situation in the work of giving up drinking and smoking, mostly because of deep poisoning.