nothing is perfect. of course human is the same.
sometimes, the good thing or the thing u thinks its good might not have to be yours. even the thing u like. because it might be bad to u. just like having fast food constantly. indeed, it's nice and tasty. but in a long run, it would harm ur health and you're the one who get the bad effect at last. since you know it at the beginning, why not just prevent? Prevention is better than cure, always. Yan, don't be stubborn. You've tried once. or twice, perhaps. Never ever try for the third time. No one could help you except you yourself. You know yourself better than no one else. Self control :)