Does Crystal Meth Affect The Treatment Process Of Non-Hodgkin S Lymphoma?

Hello, my question is how will it effect chrystal meth only using like once a week while beeing treated for non-hodgkins lymphoma and the medications given are: 1) Doxorubicin (brand names: Adriamycin, Rubex) 2) Vincristine (Trade names: Oncovin, Vincasar Pfs) (Other names: Vincristine Sulfate, LCR, VCR) and 3) Cyclophosphamide (Trade names: Cytoxan, Neosar). My sessions are done every three weeks.