Good for you OP, whatever you can use as leverage against this 'black dog' (Michael will understand the reference, or at least his avatar will) is a
real positive.
I've been on the same road as you for too many years now, some days are good some are hopeless, with a sprinkling of ones that I'd rather just
forget about.
My advice though would be to stay away from pharma's at all costs. I've been on numerous regimes in the past and some will literally rip the life
out of you, others will leave you with the dreaded Brainzaps - the depression is actually easier to deal with than them! Not to mention a nasty little
chemical dependence problem.
I'll leave you with this: A very wise Buddhist friend of mine once told me that depression is addictive, so your cigarette analogy resonated with me.
He said that sometimes the feelings we have when in this (negative) state can give us a kind of hit and allow us to become self-absorbed and
self-centred.
I learned from this that its important to fill your mind with as much activity as you can, keep yourself busy and distracted from dwelling on your
internal problems and anxieties. I know its sometimes not easy - just like giving up smoking