Hi there,
Agree with herbavore, sound advice as always from her.
In my opinion your usage and frequency is quite moderate and I personally wouldn't say its "off the hook", but regardless of how minimal the amount or infrequency of whatever substance you use, it's never a good thing to have drugs involved in your life.
(aside from prescribed drugs that may be essential for a medical condition and as long as i'ts not abused)
Even when drug use starts off to be occassional and sensible amounts used and seems quite harmless and controllable, there is always the potential for that to change drastically. And believe me it does. Very easily. Before you even begin to realise how far it's going and as much as you believe it won't happen to you.
Drugs are sneaky bastards, they make you believe your justifications and excuses of why you use them, while all the time creeping up on you with the intention of taking over your life, unless you realise early enough and take control before they take you.
The fact you are questioning what you do and that it could be or become a problem is the wisest thing to do, instead of just going with the flow, justifying and excusing it and getting deeper and deeper into its clutches.
I only know this because it's happened to me and although I still use, due to the fact recreation is now addiction, It makes me sad how to see how many people's lives are being taken over and ruined by using all this shit.
If you can turn your use down then I suggest that you do, give it a try, it can only be a good thing can't it? You may (hopefully) even realise how much better off your life is without it.
Don't get me wrong I've had some amazing times and as someone else has posted I don't regret all of it, but at the same time the place it has lead me to now, I also deeply regret ever having the interest i've had and wish I had never started in the first place. It has caused so much more damage than it has given me good times, and it's so much easier to handle before you go too far than it is to try and get back what it has robbed from your life when you are up to your neck it in.