Replace the ritual with a healthier one: journaling, soft music, or gentle stretching
Siegel AB, Conner K, Wang S, Jacobson JS, Hershman DL, Hidalgo R, et al
Dipping and chewing negates that and takes away from all the gains. Among the reasons why using smokeless tobacco impacts a users personal health - along with negatively impacting mission readiness - are decreased muscle strength
You can learn to give yourself the best chance to pass these screens and stay off nicotine afterward, if you want to keep going with what you've started
Chronic irritation from poor oral hygiene, ill-fitting dentures, and persistent rubbing also contributes to DNA damage over time