Second hand smoke - not really. But hotboxing is including the smoke from the lit end, not being inhaled by the smoker - so yes. Easily. If you breath in smoke from the lit end, your breathing in THC. - although they dont test for THC, they test for the cannabinoids and cannabinols left. THC is only in the blood for 2 -4 hours. After that it's gone. Poof.