I gave up coffee only because I have a lot of issues with food and it started triggering migraines (probably the cockroach bits, sorry!). Even then, I was only able to give it up after getting the flu and losing the taste for it because I was so sick.

If I'd suspected it was just the caffeine artificially keeping my blood pressure high, I would not have worried about that. 135/85 due to caffeine sounds just fine to me.