I hear you brother, that was me until about ten years ago. "An eighth a week is all I ask"; I'd already left the meth, 'shrooms and 'cid behind as relics of my youth, but the reefer was hard to give up. Now I don't use any recreational drugs. Drink decaf even. Quit smoking cigs about five and a half years ago.
Now the bad side: I'm badly overweight, and I have finally been given a wake up call at 46: high blood pressure. My cholesterol is actually low, which annoys my other half (more eggs, dear; back off!), but the blood pressure is going to be a problem. The doctor says I need to lose at least fifty pounds. So, I've actually started excercising more. I already rode a bike and/or walked everywhere, I've now started lifting for the first time in twenty years (and I'm still amazed at the difference 20 years makes!!) three times a week. The weight is going down, but too slowly; I need to face up to the fact that even the metabolism boost the lifting gives me, I'm going to have to alter my diet. Of course, the thing that sucks there is that I'm old enough to know that a "diet" isn't something to "go on" and then "get off"; it's for life.
I see other people my age, and it seems to be a mix. Some are doing great, and some are starting to just give up, unsnap their pants in the evening and turn into sludge while waiting for death. Me, I'm not ready yet...
Edited to answer the damned question: Claritin and Paxil CR, if you must know...