Tougher question: Alcohol or Marijuana?

Alcohol has good and bad.

Alcohol(within limits) is good for your health! (heart, cholesterol)
When abused, alcoholics are bad for all involved.
When abused, alcohol is also damaging to the liver.

When abused, marijuana is damaging to the brain.
Can someone tell me if there is a health benefit to marijuana?
I know it is pain relieving like for those suffering with certain cancers, etc.
Anything else?

I wouldn't want someone driving under the influence of either.

If alcohol was illegal, I wonder what the priests would use during mass?