You are perfectly free to do what you want to, in my opinion, and Im not pointing fingers on you or anyone specially. I just dont like coke, and Im talking about how it makes me feel, so I dont see it as something positive. But if you feel good when you take it and you feel you live a good and solid quality life, Im not telling you to stop doing it.
I feel bad for all the kinds that think they will boost their confidence when they go out at night snorting a line but might end up selling their underwear for a fix... you know what I mean. Its messed up.
The reason you can control it is because you actually seem to have informed yourself about the effects and how the abstinece works etc. And because of the information you can use it instead of abusing it. So my point is that information is the key! Not making it illegal.