Well, one of my friends is Buddhist, though he eats meat and has drunk alcohol, though he doesn't usually as he just doesn't like it, which violates the 5 precepts according to interpretation of me and my other friends who have studied RS. What he told me was that there are more versions of the religion than you can count, lots of different sects who do their own thing as it's not a centralised religion. I suppose the answer is do you feel religious? Do you want to be? Just following certain rules as convention doesn't make you religious, you have to be with the mindset and BELEIVE in it.
How exactly do you view these rules in your head? Personally I am not religious but am vegetarian and vowed never to smoke anything. My resolve on both these has gone through weak points, though I have never broken them because of some subconscious override in my head somewhere(These are both choices I made solely for myself). Is it anything like that? Or do you feel that violating the rules is wrong because of the religion you think you follow?