We should legalize all drugs as the aforementioned posts suggest. The main philosophical reason is that the forbidding of drugs by the government is a violation of Rights -- that as a sovereign individual, you have the Right to choose what to ingest or inject into your body. The decision should be made between you and your doctor or pharmacist, without government interference. If it's not forbidden, then such transactions can be performed in the light of day and eliminate the underground black market with all its attendant problems.
The numbers of those addicted will be substantially less if drugs are made legal. Whatever problems that do arise with abuse, they can be treated medically, instead of criminally.
First, I think that this question should be moved to the Discussion boards.
What I think that you are searching for is support for the legalization of drugs and you will receive a lot of differing views on the legalization of drugs.
One could easily argue that drugs (which are currently illegal) should be legalized given the government would be able to collect taxes on the sale of the drugs (at higher rates than normal items). Another reason that one may state drugs need to be legalized is the fact that it would reduce the overpopulation in prisons. Given that many people have been incarcerated because of drug charges, the legalization of the drugs would allow the courts to reduce the drug cases and the number of people going to prison/jail for the charges.
Outside of that, there is another side to the argument: we should not legalize drugs. The support for this is that illegal drugs are illegal for a reason: they can be seen as harmful to the human body and society at large.
Either way, I am sure if this question is moved, you will receive many different points-of-view regarding the legalization of drugs.