An?l???? ?f th? ??rr?l?t??n b?tw??n the u?? ?file 18 v?r??u? ????h???t?v? ?ub?t?n??? demonstrates th?t ?????n? use correlates w?th ?th?r “occasion drug?” (?u?h ?? ???t??? ?r ?m?h?t?m?n??), ?? w?ll ?? w?th h?r??n ?nd b?nz?d??z???n?? u??, ?nd ??n b? ??n??d?r?d ?? a bridge amongst th? u?? ?file d?ff?r?nt gr?u?? ?f drug?.S???db?ll?ng may be ve