If you're concerned about having the temptation available when you know you definitely aren't ready yet, then I wouldn't recommend it. But having said that, a lot of people can find solace in the knowledge that they do have it available to them if the need does arise in the future.
If you think it would help you feel more content about continuing with your life, then it might not be a bad idea. We can't predict how things will change in the future, and it's entirely possible the sales of SN might become more restrictive as time passes. I've heard that it effectively doesn't expire if you keep in its original air-tight packaging and it can still last up to 3 years if it isn't stored air-tight (if anyone else knows more, please do correct me).
So, if it's something you think you would seriously want in the future, there's no harm in ordering it now to be prepared, since you never know how available it might be in the future. The only reason I would advise against ordering it now, is in the situation I mentioned at first, if you think it would pose a genuine risk to your wellbeing by having it around. Definitely give it some thought and remember there's no need to make any hasty decisions. I hope that whichever you decide will work out for you ^^