Diva. Now remember girl, the hammer was not designed as a sex toy.
No actually this has happened to me before but as a result of a little rope play. If your mainsqueeze (or mainsuck in this case) has no problem in attaining an erection and there isn't any pain associated with that erection you probally just gave him a "tubular hickey". If the bruising was over the entire length of the "shaft" ( and you and I know that "that Cat Shaft is a badmotherfucker") and your able to orally take that much in that much cock then it more than likely came from the resulting stimulation or negative atmospheric pressure.
I don’t think that the THC therapy had much to do with the bruising.
However it more than likely helped your ability to enjoy that prolonged oral stimulation.
To me the bigger question is “how is your jaw?”

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Sex is a tricky thing best left to professionals.