- It can be snorted, taken orally, or smoked (most common method).
Here (Europe) smoking isn't at all common, and snorting is usual. --Taw
In eastern Europe the most usual is injecting Methamphetamine. -- DA
I find it VERY problematic to speak about "positive", "neutral" and "negative" effects of anything (not only of a drug). This is NOT OBJECTIVE, not from the neutral point-of-view, as Wikipedia should be.
Pharmacology (effects and mechanisms of action, including dangers due to behavioral change (as traffic accidents, aggressive beh. etc.))
Toxicology (harmful effects by the drug itself)
Accepted medical applications
Sociology - including all the non-medical apps. (common use in different socienties - of course, the medical apps. are a part of this also)