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You've Packed The Pipe Too Loosely For heat to be transferred downhill through the bowl, the tobacco has to be packed tightly enough

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In high humidity environments, unique "drip-lip" internal construction prevents tar condensation from escaping

Dimensions: 2245 x 3240 px | 19 x 27.4 cm | 7.5 x 10.8 inches | 300dpi Photographer: GRANGER Historical Picture Archive More information: This image could have imperfections as its either historical or reportage.

doi:10.1038/nature08758 pmid:20148031 Taylor AM, Castonguay A, Taylor AJ, Murphy NP, Ghogha A, Cook C, Xue L, Olmstead MC, De Koninck Y, Evans CJ, Cahill CM (2015) Microglia disrupt mesolimbic reward circuitry in chronic pain