Crack heads might make good porters. They work for crack... they don't eat. Crack is light - I'm sure the gram weenies could appreciate that.
The only problem is they are usually weak and scrawny - maybe the crack gives them strength. I'd want to make sure they could lift my boat.
I think most crackheads tend to be afraid of the outdoors too. At least that is the impression I get. I don't run into many.
I think the drug use you'd run into in the wild is marijuana and alcohol. Gram weenies definitely go for weed. It is much lighter. It wouldn't be a problem if we were in CO or CA.