First of all, if you feel chest tightness, it is recommended to stop smoking e-cigarettes for health reasons and observe the situation.
Secondly, check if there is any problem with your own smoke oil, and if you have purchased inferior smoke oil.
The other is whether this is a smoking cessation syndrome. Some people will have some symptoms such as physical weakness and chest tightness after quitting smoking.
Finally, because the electronic cigarette contains glycerin, it will absorb water and dry easily, so drink plenty of water.