Rule number one of parenting: Never show your bad habits in front of your kids. Breaking that rule so bad that the kid takes influence and tries to copy the same bad habit, you, dear parents, have failed epically at parenting.
Here we see an exhibit of extremely bad and immature parenting. The parents video tape this act of the kid, while the kid has a lit cigarette in his hand (held properly like a smoker would) and tries to smoke it. This kid is barely 3, maybe even younger and he knows not only how to hold a cigarette but also know to smoke it. He laughs shyly as his parents like a kid would but what is infuriating is how the parents laugh at it.
More so, the kid even mimics the act of flicking the ash of the cigarette onto the ashtray and then pretends to release smoke from his mouth. It is obvious he has learned all of this from observation. These parents, instead of trying not to smoke in front of him, obviously do smoke but also find it funny when he copies it. Parenting 0/10.