A. smithi is an arboreal species which lives in the canopies of large trees in the cloud forests of the Sierra Madre de Chiapas. Its elevational range is 1,800–2,800 m (5,900–9,200 ft) above sea level.
A. smithi is viviparous.
A. smithi is only known to exist in a few localities in Chiapas. It is uncommon and may be threatened by deforestation, but it occurs in protected habitat, including the El Triunfo Biosphere Reserve.