Another option is to boost up your morale as much as possible, cos elated gives you a general stat bonus.
Don’t take too many stims and depressants, though. Xanax is a really good one, because it’s gives a good bonus without counting on your drug total (afaik).
Otherwise, eat lots of hot meals, types of crisps, drinks, smoke anything you can find (weed, cigs and cigars all together will make for some hefty morale bonus)
You should be able to get 3/4 int just from the morale, and more from the cigarettes and stimulants.