Fumitory, Fumaria officinalis, is a common weed throughout Europe; it has attractive feathery leaves, with unusual narrow tubular flowers arranged in spikes. The plant has a scrambling habit, with much branched fragile stems. Surprisingly it is a member of the poppy family, but very unlike a typical poppy; the flowers are zygomorphic, that is they have two symmetrical halves. They are pollinated by bees or are self pollinating.

As the species name officinalis suggests plants have been used medicinally, but overdose can be fatal, so it is not recommended.

Possible explanations for the smokey names include the appearance of the plant suggests smoke arising from the ground or the effect they have on the eyes, which water when rubbed after handling the plant, as if exposed to smoke.