From Chapter 9:
Later again when the "couple o' Sawbones," the medical students, Ben Allen and Bob Sawyer, make their first appearance on the scene, they are discovered in the morning seated by Mr. Wardle's kitchen fire, smoking cigars; and it is significant of how smoking out of doors was then regarded that Dickens, going on to describe Sawyer in detail, refers to "that sort of slovenly smartness, and swaggering gait, which is peculiar to young gentlemen who smoke in the streets by day, shout and scream in the same by night, call waiters by their Christian names, and do various other acts and deeds of an equally facetious description." Apparently in 1836 the only person who would allow himself to be seen smoking in the street was of the kind naturally inclined to do the other objectionable things mentioned. The same idea runs through the allusions to tobacco in "Pickwick." smoking was undeniably vulgar. Mr. John Smauker, who introduces Sam Weller at the "friendly swarry" of the Bath footmen, smokes a cigar "through an amber tube"—cigar-holders were a novelty. When Mr. Pickwick is taken to the house of Namby, the sheriffs' officer, the "principal features" of the front parlour are "fresh sand and stale tobacco smoke." One of the occupants of the room is a "mere boy of nineteen or twenty, who, though it was yet barely ten o'clock, was drinking gin and water, and smoking a cigar, amusements to which, judging from his inflamed countenance, he had devoted himself pretty constantly for the last year or two of his life." Tobacco-smoke pervades the Fleet prison. In fact, to trace tobacco through the pages of "Pickwick" is to realize vividly how vulgar if not vicious an accomplishment smoking was considered by the fashionable world and how popular it was among the nobodies of the unfashionable world.

From Chapter 15:
Sir Walter Scott said that in London a Scotchman would walk half a mile farther to purchase his ounce of snuff where the sign of the Highlander announced a North Briton.

Dickens's little figure, which adorned old Sol Gills's shop, "thrust itself out above the pavement, right leg foremost," with shoe buckles and flapped waistcoat very much unlike the real thing, and "bore at its right eye the most offensively disproportionate piece of machinery." But this was only one of many "little timber midshipmen in obsolete naval uniforms, eternally employed outside the shop-doors of nautical instrument-makers in taking observations of the hackney-coaches." All have disappeared, together with the black dolls of the rag shops and many other old-time figures. A stray highlander or two, or other figure, may survive here and there; but with very few exceptions indeed, the once abundant tobacconists' signs have disappeared from our streets as completely as the emblemsand tokens of other trades.