Be sure to give specificsif the driveway is a designated smoking area but any indoor consumption is off limits, be sure those rules are clearly stated
The issue could be due to debris or any other random objects
if you dont smoke, dont vape. Just so that my position is clear for the rest of the article: I do not want to promote e-cigarettes, just as Chris Whitty would not recommend them to someone who has never smoked or vaped

(1958, March) Long live the victory of the great Mao Zedong Thought (Early 1960s) Keep the Chairman's words firmly in mind to be revolutionaries for ever (1965, July) Man's world is mutable, seas become mulberry fields - Chairman Mao inspects the situation of the Great Proletarian Revolution in Northern, South-Central and Eastern China (1967, December) Cordial guidance (1971, February) The great Commander-in-chief points the direction (1971, July) New Spring in Yan'an (1972) The dawn of Yan'an (1972, April ) We must bring the Hai River under permanent control (1972, June) The hearts of the sons and daughters of Yan'an go out to Chairman Mao (1974, September) Speaking glowingly of the excellent situation (1974, September) Watching a friendly match between armymen and civilians (Selected from the Huxian peasant painting exhibition) (ca