My husband's niece works in an M.D.'s office. She said that marijuang may be my husband's problem. He is on Kidney dialysis. He has a graft in his arm. He smokes a lot of marijuana daily. Uniquely, he has been having a hard time with blood clotting in his arm which requires surgery. This has happened 4X. I've understood that m.j. speeds up your heart and blood pressure....not slowing it. Is that a problem?