What amounts of illegal drugs do have to take to go through withdrawals?
Depends which drug. Ones which are strongly psychologically addictive can be just s hard to stop as ones which are physically addictive. Generally to get serious withdrawl symptons you would have been taking the drug regularly for some time, weeks even months. It is a myth that you can get addicted immediately, though drugs like crack are very moorish and hard to put down after a good session. Heroin and crystal meth are probably the worst for addiction and withdrawl problems and once you have a habit it is almost impossible to get rid of it, even with proffessional help. I speak from experience. Beware!!
