I had this conversation with my Doc just recently. Like you I'm in my mid 30's with high bp and am on Lisinopril. According to her there is some debate about just how harmful mj is to folks with hypertension. While there is an initial rise in bp after smoking it does tend to relax the user afterwards with a corresponding lowering of the bp. Not to dangerously low levels, though. She did give me the lecture about smoking anything and doing any drugs. Afterwards, however, she did add that,although she's concerned about me doing drugs, she'd be a lot more concerned about my blood pressure if I was drinking Starbucks every day or eating loads of salty stuff. Like Beeble says though- checking with your own doc is the safest bet.