don't know what kind of work you do but I would be really cautious about the drinking on lunch. make a mistake later in the day and someone smells alcohol on your breath, or god forbid there is an accident & they blood test you and you are royally screwed. all your good thoughts, performance etc goes right out the window.

seriously if you have to drink to get thru the day that is not a good thing. your other steps seem to be a decent way of coping. no one should care if you smoke unless it is a smoke free campus (again then you are placing yourself at risk...which seems like you are doing risky behavior to get yourself fired)

apply for jobs,
remember work is only 8 hrs of the day and doesn't define who you are
instead of the smoking & drinking on nice days try going for a walk..a 15 min walk will improve your mental outlook, give you exercise and physically remove you from the workplace for a bit

remember , you as an employee don't have access to upper management's thinking...there might just be more to their actions, you don't know. just because it seems like a crappy move to you, doesn't mean there isn't more to it. you as a non-management employee are not privy to all the company actions, and plans, which can be frustrating at times. something to remember. let the big decisions and actions float over you and don't take them personally. unless asked, they are not your problem (as in you don't make the call , obviously you want the workplace to be successful)