Top 10 Gas Mask Bongs For Getting Really, Really High

The short answer: yes! A weed gas mask bong is an incredibly efficient way to get really high without wasting much green. This is all thanks to the “hot box” you can create around your face, conserving and recycling the smoke before it floats away.

Source: https://americanmarijuana.org/top-10-gas-mask-bongs/