Recreational is fine (although I myself haven't consumed any so far), it becomes a problem when the use has an escapist background. Also, drugs are only addictive if their use offers a 'better' reality, MDMA and LSD for example are very situational drugs therefore rarely addictive (besides, everything can become an addiction).
Weed and other opiates should be seen as a temporary stimulant/relief, it becomes a problem when their use becomes highly regular. One should find the source of their stress instead of trying to ignore it.