A clear explanation of drug addiction how human factor that may cause ill health, accidents, crises or disaster.

5 answers

http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002490/

http://en.wikipedia.org/wiki/Substance_dependence

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by avoiding bad friend, or going to therapy if your in drugs maybe it can change us as youth.
It can leads to unintended consequences such as Hiv/AIDS,sroke.drugs such as mandrax,nicotine damages brain cell.
A cear exaplanation of alcoholism of human factor that may cause ill heath,accidents ,crises or disaster
Can someone help me with the consequences of this human factor