stoner

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that stones.
• noun Slang One who habitually uses marijuana or other drugs.

from The Century Dictionary.

• noun One who or that which stones, in any sense of that word.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who stones; one who makes an assault with stones.
• noun One who walls with stones.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One who stones.
• noun A machine to remove the stones (pits) from fruit.
• noun slang A habitual user of cannabis.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an attacker who pelts the victim with stones (especially with intent to kill)