Assertion: thc's effect | /r/CapableOf | last only 3 to 4 hours
Facets:
Source sentences:
text: Although reductions in intraocular pressure have been reported, the effect lasts only 3 to 4 hours, necessitating a dosing frequency of 6 to 8 times a day with a consequent risk of initiating substance abuse among users.
text: Smoking cannabis or Sativex spray seems to reduce eye pressure in people with glaucoma, but the effect may last for only three to four hours .