@Imnotrussian,
Ask yourself in terms of your personal responsibilities, including 1) your use of money, 2) your use of time, 3) your obligations to school or work, 4) your obligations to your family (including bettering yourself and keeping yourself healthy).
How do you judge yourself? You can rationalize that you're responsible, but you
know that what you're doing can be fatal (however unlikely), and you
know that many people lose control of it despite belief to the contrary.
So without taking for granted that you
know you're safe, can you give yourself a complete 100% pass? You wouldn't have asked the question unless you had
some sort of concern about it...