I know personally that .science domains are difficult to sell (except for $ to $$ to other domainers). Unfortunately the original owners (FFM) of the registry started it in wrong direction with deep discounting rather than promoting legitimate use. The last almost year under new management, no deep discounting, and abuse down (current Spamhaus score 1.3 not much different than .com/.net).
There is a lot of interest in science of THC (around legalization in some jurisdictions) and your name would be perfectly descriptive. I would ask for mid/low $$$ but don't expect easy sell. If keeping one I would keep THC. Right now renewal costs not bad. Good luck.
Bob
(If you have expertise a mini reference site on it would generate at least enough to cover renewals and possibly help sale eventually)
Edit -- I should have mentioned I don't know THC/ganja niche at all, just commenting on .science as TLD