Weed is a general term for a plant growing in unwanted places. Ever since humans first attempted the cultivation of plants, they have had to fight the invasion by weeds into areas chosen for crops. Some unwanted plants, later, were found to have virtues not originally suspected and so were removed from the category of weeds and taken under cultivation. Other cultivated plants, when converted to new climates, escaped cultivation and became weeds. If some one is suffering from weed addiction then contact to the nearest weed addiction rehab..