My weight doesn't really change, a very slow upward drift. When my ex and I were hooked on various dopes together, whenever we could stay high we'd eat a lot of food, good-for-us and nasty foods alike, she would gain weight. I've seen pictures of her before we dated when she was doing even more, and she was bigger than I'd ever seen her in person. When we ran out of money/connects and were withdrawing, however, she'd drop weight like a rock. She even admitting to liking that part of detoxing once.
