Don’t feel high sometimes?

Sometimes when I smoke weed whether it’s flower or vape I don’t feel high. Then if I try again a few hours after or the next day then I can feel high again. I noticed that this happens randomly, but it always happens when I’m tired or have been drinking. Plus, before smoking thc concentrate vapes really gave me an effect, now they just finish very fast and don’t give me the same high all the time.
Don’t feel high sometimes?
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