How to stop yourself from getting caught in memories as a stoner?

I can’t seem to stop reminiscing when I’m high. I find myself getting lost in thoughts and fantasies about people who are no longer in my life and whom I miss. I don’t think it’s good for me to be lingering on these memories so much, but I don’t really want to cut back on smoking. Any other ways I can help myself move through this and get over it while still smoking? TIA