If I were to look back over my life - at the risk of experiencing a degree of vertigo - I should say that prior to the events that turned it upside down, I was an unremarkable man, bordering on the extremely ordinary. I had a wife, a daughter, a profession in which I was known and appreciated, and a criminal record as white and clean as a sheet of Canson paper bought from an art supplies store. Subsequently, an attempt was made to unseat me at work, my wife left me, and I had four murders to my name. An unusual trajectory which, if I had to sum it up in a simple, universally accessible phrase, I would say was ''all down to the cigarettes.'' It was in 2007 that the heinous law took effect. The law that drove smokers to colonise any available outdoor space within their office complexes, "authorised areas" that didn''t remain authorised for long. The maintenance teams or cleaning operatives soon made it known that the sudden increase in their workload, occasioned by the proliferation of cigarette butts, would quickly become unmanageable without an equally consequent re- evaluation of the fruits of their labour. Businesses ignored their demands, and smokers were thrown out on to the street.

"These heinous laws will have everyone doing it in the road." I suggested the shock phrase to my lawyer, with a subtle nod to Marthe Richard''s law of April 1946 that ordered - with not a trace of irony - the shutting down of the maisons closes : luxurious, legal brothels across France, where champagne and other delights had been liberally dispensed for decades. Proprietors and Madams suffered the torments of nervous depression, previously known only to bourgeois ladies of leisure and their over-worked husbands. As for the girls, they found themselves out on the street. Self- employed, until they fell into the clutches of merciless, often violent, pimps. Our sweetest vices - stockings and suspenders, champagne, curls of smoke, cigars, blondes in bustiers (or packs of twenty) - have ended up out on the street with the refuse, and the State as sanitizer-in-chief. The dreams of our elected representatives are the nightmares of science fiction: a world where no one smokes and no one drinks, where the men are all thrusting executives with dazzling teeth and careers to match, and the women are all smiling, professionally fulfilled mothers of two- point-five children. Sanctimonious laws for the good of one and all are the building blocks, brick by brick, of a sad, uniform world that reeks of bleach.

My lawyer was unconvinced by my reasoning, and still less so by its application to my case. Obviously, he would cite my nicotine dependency, but "without making too much of that side of things", as he put it. I wasn''t standing before him for having smoked in a public place - it was ''a little more serious than that, Monsieur Valantine.'' There are various ways to embark on a criminal career. The first is to discover a compelling vocation of sorts. Serial killers are an excellent, precocious example: from an early age they feel different, and experience strong animosity to the world around them, coupled with a highly questionable determination to shape it to their own ends. Psychopathic, schizophrenic, paranoiac: medical terminology abounds for those who choose to dispatch their neighbour, often with elaborately staged savagery. And yet, by reproducing the same scenario from one crime to the next, they are quickly identified and generally end up behind bars, where they keep their psychiatrists happily occupied and, more recently, secure fortunes for their chroniclers in fiction.

Above all, it''s important to distinguish the murderer - an occasional killer - from the assassin, who has made murder his profession. The murderer may be the unhappy, cheated husband who, discovering his misfortune, seizes his hunting rifle or his lobster-knife: if his career ends there, he will retain the title of ''murderer''. But the assassin carries it forward, from crime to crime. The number of lives forfeited, and the resulting criminal record, are central to this choice of terminology. A murderer may be a bank robber who finds himself cornered by the forces of law and order, uses his weapon and kills two or three police officers. He is a dangerous animal, but blood was never his primary motive, only money. That said, the attempt to secure bags of someone else''s cash regularly leads to violent misunderstandings with bank cashiers the world over. Where among these examples would I situate myself? I''m a little of each at once.

From the initial forced mishap, to a profound degree of premeditation. At the beginning of his career, the smoker is generally intent on killing no one but himself. But forces beyond my control drove me to become a killer of others. And not through passive smoking. When it came to murder, I played an active role. A very active role. The mechanism that drove me to break first the eleventh commandment - Thou Shalt Not Smoke - and after that, the sixth, Thou Shalt Not Kill, was set in motion one winter, that grey-white season, the colour of ashes and smoke, in my fiftieth year. As a hardened, confirmed smoker, two packs of blondes a day, who had exercised the regal prerogative of smoking in my office for fifteen years and more, the first blow came with the proclamation of the law that banned smoking on business premises, other than in areas specially designated for the purpose.

Initially, at HBC Consulting - Europe''s biggest firm of head- hunters - we chose to ignore the ruling. The department heads were untouchable: no one would dare ask Véronique Beauffancourt, Jean Gold or myself to extinguish what was, for each of us, an extension of our anatomy. We were smokers of power. Nothing could bring us down. But dare they did. The French Revolution must have had its roots in some rustic inn, one afternoon, where a man with a bigger mouth than everyone else slammed his tankard of wine down on the table and hollered ''Death to the King!'', to the applause of the small assembled company. The man''s name, the names of the men who cheered him on, and the inn where the scene took place are forgotten now. Precisely the same thing happened in business premises across France, in the early years of the new millennium.

At HBC Consulting, the rebellion was sparked in the canteen, whose gruff team-mates found their Saint-Just in the person of a highly attractive young blonde who fuelled many a conversation during the month she worked for us. This long-legged creature, as open and inviting as the prison doors I would come to know, loathed cigarette smoke with a vengeance. Her beauty was matched only by her intolerance to our poison of choice. And yet my male colleagues, who were in the habit of lunching in the nearby cafés, had all made a hasty return to the canteen. With its sub-standard food and pointless view over the rooftops of Paris, overheated in summer and freezing in winter, the HBC canteen had suddenly acquired the allure of a changing-room backstage at a Fashion Week runway show. None of the men paid the least attention to their food - indeed, many ate nothing at all - but all were mesmerised by the new arrival''s figure. ''She''s temping. She''s a model really,'' breathed the frightful Jean Verider - Search Director for Marketing - at lunch one day.

''Did you ask her?'' I said. Nose down in his grated carrot salad, he flushed a deep red. ''No, Françoise in Human Resources told me.'' The girl''s beauty was plain to see; and her loathing of us all, with our grey suits and grey hair, was plain to see, too. Her loathing of us, and her distaste for the canteen job she was forced to take while waiting for glory on the covers of the glossy magazines, constituted - I''m quite certain - the ingredients for the Molotov cocktail that shook our bastion of privilege. Our exterminating angel managed to convince the refectory harpies that they were entirely within their rights to insist on the smoking ban at their place of work. One lunchtime, as we were all arriving to eat, Véronique Beauffancourt asked for an ashtray and was refused. The large woman dishing out the cooked vegetables and sliced meat pointed to a small sticker she had doubtless affixed to the wall with her fat, pudgy-fingered hands, experiencing the same heady excitement and anticipation she had known on her wedding night, and at no time since.

A cigarette inside a red circle, the latter scored through with an oblique line of the same colour. Véronique, suffering the pressures of a late divorce, declared it was a scandal, and was immediately joined by Jean Gold with his collector''s Dunhill pipe ('' Impression Caviar ''). It so happened that Gold had set his sights on Véronique. For him, the incident was timely indeed. The events that ensued led to their joyful union, and they still write even now, always with the same (to me) slightly irritating opening address: ''Poor, dear Fabrice [comma].'' I remember asking, that lunchtime, if this was some sort of joke. And the fat lady replying that indeed it was not, it was the law, and high time it was respected, or prosecutions would ensue. We were left speechless at the woman''s nerve.

Immediately, a committee was formed to draft a stinging riposte and a direct appeal to Hubert Beauchamps-Charellier himself. Stirred by the small flurry of excitement on the smokers'' tables, even Jean Verider - who was extremely reserved as a rule - was moved to speak, asking the whereabouts of the blonde canteen girl, who was nowhere to be seen. A small, thin, short-haired woman, whom we all strongly suspected of belonging to Lutte Ouvrière or some other sect-like crucible of workers'' revolt,.