Is It Safe To Smoke After Suffering From Traumatic Subarachnoid Haemorrhage?

Hi Doctor. I m a 28 yr old Indian Male. I recently had a small fall while rock-climbing and passed out and do not remember clearly the events of that day (including the ambulance ride, stay in ICU). CT scan showed I suffered a traumatic subarachnoid haemorrhage - tentorial and left cisterna ambiens. I had extreme dizziness for a week which has quickly improved to almost near normal pre-accident state now. I have restarted smoking (2-4 cigs/day while pre-accident it was ~15/day). Is this likely to be dangerous? I experienced mild dizziness when I first restarted smoking, but now that has passed. I also want to know what the potential effects of mild alcohol intake (say 2 pints of beer) or occasional marijuana usage (if smoking is a problem I may have it in some tea) as well as physical activity are likely to be. Thanks in advance for your response.