the problem with habitual use is that eventually you will become accustomed to it, and then it become irreplaceable. suddenly you cant have a good time with freinds without blow. cant get a hard-on without blow. cant get any satisfaction of any kind unless youve done a few lines. remember, these arent physiological effects, necessarily, but even a very intelligent person can fool themselves into using. if your body likes it, and it sounds like it does, it will BECOME reasonable, safe and even necessary. this doesnt happen to everyone, of course, but is it worth the risk?
once you become habituated (and if), tolerance becomes an issue. suddenly you will need more and more to get off, and you will pay for this. this is how bad shit starts... this is how smart, good people become addicts and throw their entire lives away for that quickly fading buzz.
i think coke is a fun experience, now and then, but two hours in the only thing that can stop the comedown is more coke. then it isnt fun anymore. then its a habit. then its an occupation. then its full-time, and trust me, there's no fucking health plan.
i would say quit while you're ahead.. in my experience coke on ANY kind of schedule is just asking for trouble.