4. Coughing
Probably the most common symptom of tobacco smoking cessation, along with sputum / phlegm production. The severity and duration may depend on how heavy a smoker you were before switching, and how many cigarettes are smoked while transitioning to
vaping.
5. Sputum, Phlegm
When quitting smoking, with or without using e-cigs, people find that they start coughing up all the junk they've been putting in - tars and other materials coating the surface of the lungs. This material is coughed up in the form of phlegm / sputum.
Some may find they start coughing up this junk within a week or two - some faster. The duration will vary, but most people find the morning cough went away in the first week and the rest of the junk came up within the first month. One of the most common symptoms of smoking cessation.