Vaping tinctures is not the best idea because tinctures are meant to be ingested through the stomach. When vaping you need a solution that is a bit more viscous so as the vapor does not burn you internally.
Besides vaping which isn’t a bad idea, might I recommend cannabis suppositories from companies like Foria and Back Door Medicine? For Crohn’s and Ulcerative colitis, one can take prescription medications like Mesalamine in rectal suppository form and so this method is already in use. Some studies also measure the % of medication that is bioavailable through suppositories to be higher than the amounts seen in vaping. I hope this also helps!