Yes.
If you can buy cigarettes, then you should also have the right to try and kill yourself in any other manner you choose.

I think marijuana, hash and their derivatives should be sold freely, to anyone of legal age, and widely distributed. The ease of buying it should be the same as going into the corner store for a 6 pack.

But I think the rest of them should be tightly controlled by the govenment and only existing addicts should have prescriptions.

With the enormous profits, money could go towards more rehab centers, reducing taxation, and taking a huge bite out of organized crime. There wouldn't be many more addicts than there already are...and there would be a lot less drug-related crimes.