a smoking trick where one blows or exhales rings of smoke

listen to the pronunciation of a smoking trick where one blows or exhales rings of smoke
الإنجليزية - الإنجليزية
smoke ring

A smoke ring persists for a surprisingly long time, illustrating the slow rate at which viscosity dissipates the energy of a vortex.

a smoking trick where one blows or exhales rings of smoke
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