Hybrid: When Aficionados of Cannabis Seed Bank (ACSB) introduced Vishnu Kush to Bubblegum Kush, it produced a sweet sensation called Birthday Cake (also called Birthday Cake Kush). This cake reportedly delivers 24%-26% THC along with spicy, piney smoke and a sweet taste, according to ACSB. Birthday Cake delivers relaxing, psychedelic effects, according to ACSB.