Please Answer…what Is It Like to Take Drugs?

For school im doing a GCSE drama stylised piece where i am a drug addict in rehab…i want 2 know:
– what effects can it give u long term?
– how hard is it to cope with the temptation?
– what signs are reconisable to a audience if the play is styalised?
– what (good or bad) efects it can have?
there the only questions i can think of but if any1 has any more info 4 me then pls dont b shy 2 give any 2 me….
thank u..it will help me alot