Can someone lead me to information on the severity of methamphetamines and marijuanas effect on hep c patients

i have a loved one with hep c but quit treatment and went back to using and i am scared for her i need info on the above so i can approach her with how serious these drugs can effect her if she continues to use and not go through with treatment. she is a very beautiful person and has been given a chance to change her life but we had a lil problem in our relationship and this seems to have caused her to relapse and just plain give up.

: http://alcoholdrugstreatment.info/can-someone-lead-me-to-information-on-the-severity-of-methamphetamines-and-marijuanas-effect-on-hep-c-patients