Though smoking and vaping is not recommended as it can have negative effects on both oral and overall health, vaping should especially be avoided after teeth whitening at least for the first few hours post whitening. Normally, vaping and tobacco smoking can lead to stained teeth if there is tar and nicotine present, abnormal damage and enamel degradation depending on the amount used, and can even lead to the gums receding. However, after teeth whitening, the damage caused by smoking and vaping can be amplified even more. This is because teeth whitening can cause teeth to become more porous and susceptible to chemicals entering the tooth. In general, if you vape it is recommended to wait at least an hour, but preferably 24 hours to allow the pores in teeth to close up and become more resistant to chemicals entering the tooth.