Bryan Gerber’s Hara Supply produces more than 100 million cones a month for mainstream brands such as Jeeter and Zig-Zag in one of the fastest-growing segments of the marijuana market.

When Bryan Gerber grinds cannabis to roll a joint, he breaks out in hives. But that hasnt stopped the 32-year-old entrepreneuralong with his co-founders Ravjot RJ Bhasin, Henry Kochhar and Thai Tranf…