how to dry tobacco leaves for smoking : Re-Hydrate Dried Out Curing Tobacco - YouTube

(EDIT: AliceD's answer also depicts the well-known staining of teeth, which are not keratinized, showing that the staining mechanism is likely a nonspecific adsorption of greasy things onto surfaces.) The stain can be fixed through the involvement of free radicals and other reactive species in cigarette smoke, like formaldehyde

Drinking plenty of water helps your kidneys flush out toxins faster

Saliva tests identify cannabis for up to 44 hours, and hair tests for 90 days

"Missouri legislature works to increase tobacco age to 21 to reflect federal law"

Firm in and water well

Gentzke AS, Wang TW, Cornelius M, et al