Still think that cannabis is harmless? Here's another reason why you shouldn't smoke pot: scientists found that teenage cannabis smoker are more likely to suffer psychotic symptoms and full-blown mental illness later in life.
Adolescent drug takers interviewed for the largest study of its kind reported experiencing at least three symptoms indicating a risk of psychosis.
These included feeling like something strange or inexplicable was taking place, suspecting they were being influenced or followed and difficulty in controlling the speed of thoughts.
Frequent drug users were more at risk but even youngsters dabbling at an early stage were vulnerable.
The researchers also found taking cannabis in adolescence creates a greater risk of developing schizophrenia than using it when older.