New Texas THC Laws Take Effect March 31, 2026: What You Need to Know The Law Office of Shawn C. Brown P.C. Texas Bans Sale of Vape Pens Even When Substance is Legal TX New hemp regulations in Southeast Texas, effective March 31, could shutter smoke shops, impacting revenue significantly due to THC limits and steep fee hikes. Click Watch Live at the link in our bio Texas' ban on disposable THC vapes is now in effect