benign: healthful; pleasant or beneficial/not malignant.
cannabis has health benefits that have been demonstrated in peer-reviewed studies. it does not lead to aggression, as with alcohol, or addiction (tho, yes, a small percentage of users may be psychologically addicted, just as they may be psychologically addicted to any substance, like chocolate.) Although different people have different responses, cannabis is generally thought to produce a happy, euphoric feeling. Some enjoy it as an aphrodisiac. It eases aches and pains. It is useful for those with arthritis, IBS, migraines and COMPLETELY stops pain from at least one type of chemotherapy, according to a study released this month.
http://journals.democraticunderground.com/RainDog/80It has helped people with glaucoma maintain their sight and at least one man with a tumor-causing disease can demonstrate that it has suppressed tumors (and is prescribed for people with glaucoma and this man and supplied by the federal govt.)
here's a PBS doc that has useful information, not propaganda:
http://watch.montanapbs.org/video/1825223761cannabis is not malignant (i..e tending to cause death.) It is impossible to overdoes on cannabis.
So, yes, prohibition is a BAD LAW that causes more harm that it stops.
However, cannabis itself is benign.
You have to be uninformed to try to claim that cannabis is not benign.