well too set things straight so too speak there is no physical addiction too pot but after several years of chronic abuse there can be psychological dependence it may also be a good thing too remember no one has ever dyed from a pot overdose a few have died of Dorito poisoning though.
There is good developing evidence that marijuana can be very addictive and marijuana addiction is now an listed separate addiction according to the DSM 5. The division of physical versus psychological addictions is synthetic and adds no value to the discussion, someone in the throws of of a full blown panic attack due to marijuana withdrawal certainly won't quibble over that.
Rattler captured it perfectly, no psychoactive chemical is good or appropriate for a developing mind. Keep in mind we are coming across large amounts of preteens abusing drug with the most common being alcohol, second being prescription drugs and third marijuana.
