Uh

No. It's actually absorbed by the stomach, and requires the gastric acid to do it. Stomach acid is usually rendered neutral in the large intestine. I would suspect it would be the same as inhaling it, but I have no clue.

Plus, while Adderall would damage your lungs, I'm pretty sure boofing it is a good way to lose your lower intestines.

Other than weakening lung tissue and damaging blood vessels, what else would it do? It wouldn't be in your system long enough to metabolize into the psychoactive or CNS stimulating product.

This combination plus a lean diet and plenty of physical exercise got me in the best shape of my life.

Like they're on so many drugs that I get a contact hangover?

Imagine judging a complete stranger, based on a throwaway comment, over the entirely subjective effects of drugs.

I'm no expert on illicit substances, but teeth are a bone matrix FILLED with lipids, that's theorized to be why certain bacteria target and eat away at the teeth in the first place while other common bacteria simply produce acids which demineralize teeth as a side effect, and the Methyl compounds will bond directly to the teeth creating a dental biofilm in this case accelerating decay, this property is used by some dental coatings in order to apply permanent ceramic fixtures to teeth with methyl methacrylate and the property is also the major cause of stains on teeth caused by smoking.

Adderall also causes dry mouth but is not associated with the same level or severity of tooth decay.

This would probably actually make for a great area of research on if different "types" of meth like methoxy, methyl, halogen, or sulfur have different severities on dental health and if there is not then it would immediately prove me wrong, but I personally could not find any such study.