1- ingestion
2- inhalation
3- contact
4- physical trauma or broken skin
Alcohol use has been shown to make it more likely that adolescents experiment with illegal drugs.
Leech Therapy was wildly used back in the year 800 B.C and is currently still in practice. It is used to stimulate blood circulation after skin grafts and reconstructive surgery. Leeches can serve as a bridge until the body can re-establish vascular connections.