I'm assuming "iincrease blood flow" to the brain might mean that it causes vasodilation, which allows more blood in, rather than vasocontriction, when the vessels tighten, which raises blood pressure, and less blood flows in. The thing is that weed causes both, usually vasoconstriction first from the act of smoking itself and then dilation after the active chemicals kick in. Increased blood flow to the brain can be both a good thing and a bad thing, depending on people's health circumstances.

I have a similar response to THCBongman. What if we suggested something and that was inaccurate or didn't work well with your particular brain-vascular system? Weed can indeed increase your chances for rupture or stroke in some people, just as it raises the risk of heart attacks and arrhythmias (that's during the vasoconstriction period). No one with any sense wants to risk that with a delicate situation in your brain. And that's your brain. Seriously. That's where you live.

Unless you can talk again to the neurologist who refered you to the neurosurgeon or get the neurosurgeon to hazard a guess himself, I'd be very wary of it, too.The possibly good news is that you smoked without incident, even having had this aneurysm or normal variation in your neurovasculature, for 15 years. So that indicates that smoking probably didn't make it worse. And the fact that he doesn't want to follow up again for five years makes me think it's low risk, too. But I'm not dumb enough to try and hazard a guess when that's all it'd be--a guess.

I think you're going to have to do what feels most right for you, knowing there might be some potential risk involved. Did they give you any other precautions? Like not to do heavy lifting or straining? Not to do things that raise your blood pressure and put that little vessel under stress?

Sorry the neurosurgeon was a jerk. They are the top dogs in the entire medical hierarchy. They train the longest and do the highest risk work. I have had neurosurgery myself and am apparently facing some again very soon for a return of the problem that was supposedly fixed 15 years ago. I meet my new surgeon tomorrow. But I'm not going to risk smoking during any of this time (I wouldn't anyway). It just seems too risky.