A close relative of mine, who'd been very bright and easy going , could pick up tunes and play them on practically any instrument after hearing them only a couple of times, sailed through exams, enjoyed learning and was put up for a scholarship to one of the best English public schools 'experimented' with marijauna.

He dropped out of school,has no qualifications, now has the attention span of a gnat, the commonsense of a 5 year old, is a drug addicted paranoid schizophrenic with violent temper tantrums when he doesn't get his own way, a 'relaxed' attitude to other peoples possessions ( what's yours is his) and has had all of the side effects listed below

    * Impairs memory and learning skills
    * Can lead to depression and decreased motivation/interest
    * Can affect work/school attendance/performance
    * Can interfere with adolescent emotional and cognitive development.

Long-term (cumulative, potentially permanent effects of chronic abuse)

    * Can lead to addiction
    * Increases risk of chronic cough, bronchitis, and emphysema
    * Can interfere with immune system
    * Increases risk of cancer of the head, neck, and lungs

Add double pneumonia to the list, the cancer was neck cancer

If getting busted stops the lad from going through all this then it will have been a blessing in disguise.