First of all, to the OP, im gonna ask what I think reefer rogue was trying to ask. What is the reason for your long break, if you don't mind. Just curious, is it military or something?

Secondly, I think the effects of getting high are altered by your state of health, and state of mind. Like, I think dopamine levels or whatever, your happiness levels effect your high. If someone is depressed, smoking won't do as much for them, just make it worse probably. Also if you have some kind of chronic illness or injury it may take your mind away from the effects.
I also have a theory of connection with libido in some way. I can't go into detail because I haven't pondered it much, but I think once that drive is lost, or constantly overused...your effects may lesson.

I certainly don't enjoy smoking as much as I used to because I get cramps in my stomach which kinda ruin the fun. Im working on detoxing my body right now in hopes of fixing this problem. Im on day 1 of 5+ days of fasting, food and marijuana. So hopefully in 5+ days, ill be able to come in here and say 5+ days.