Air Cleaning Systems

In another post I just said that unfortunately regulation is going soon to be enacted in the city where I live which is going to ban smoking in apartment buildings. It's a big problem for me as smoking outside at least for me is losing 80% of the experience.
So I am thinking to see if there is any effective air purifier system which really blocks smoking going out of the unit. To be clear I don't smoke that much, generally on Friday and Saturday evenings, and I don't really have any buildup of smoke in the unit as I smoke close to the window and within 1 hour after smoking all the smell is gone, so I don't have a problem of removing smoke buildup. However, when the regulation will be in effect my only option will be to smoke with closed windows and avoiding any smoke going outside of the unit. I know one of the problems is the A/C that I can turn it off when smoking avoiding the recirculation of air.

The real issue is if there are any reliable air purifiers which can really absorb the smoke on the fly avoiding it to get out of the unit. Any experience at this regard and any system you would suggest or it is not a feasible option?

[Seriously, if there was not a no smoking clause in the original deal you made, I would ignore the 'rule'.]
It is not related to leasing contract but to city regulations coming up. It looks like it will be effective for new leases very soon but it will be extended in 1 year to all existing leases. It will also affect condos (so even owners of their own house if it is a condo).

I am not concerned with the lingering smell as I smoke little (tipically Saturday and sometime Friday evening) staying near open windows and literally there is no smell after 1 hour. If someone comes now it is the fresher unit in the building. Problem is while I am smoking which could be detected. So all my issue is finding a good system which does not let escape detectable smoke while smoking that evening a week. After that I know I am safe as it is very fresh inside, manager came even last week for work inside and no comment at all about smoking, it is a very clean unit.

[Best bet is an exhaust hood that vents outside. Much better to remove the smoke as it happens rather than try and abate later. Beyond that, you've received some good air treatment ideas. I'll add that electrostatic precipitators work well, especially when mated with a good carbon filter installed post-precipitator.

What city are you in?]
I don't think exhaust hood is a good idea in my situation as it could actually make detectable the smoke coming put from the unit.

I do agree the best air cleaners are the ones with generous thick carbon filter (which is more important than HEPA filters in absorbing smoke). I have mixed feeling about ozone/electrostatic precipitators as while they are effective, they make a bad smell by themselves, are not healthy (particularly ozone should be used when no one is in the room) and actually could make the precipitated particles adhere more easily to the paint and carpet.

I would probably tend to use only the carbon filtration while smoking maybe with ionizers on and then making an ozone run up after smoking and leaving the room. About the position I would agree putting the air cleaner in front of the A/C intake should be ideal only problem this is a central unit A/C with the intake at the top of the wall so not easy to place the air cleaner there. I would probably end up putting in front of me at the center of the room.

About the model there are many types and I am not totally convinced there is a great difference between a 200 or 1000 $ model for my scope. I saw the Zen Living ZL-3C+ Ionic Air Purifier which is targeted toward smokers as it as an oversized carbon filter + ionizer + ozone generator. It is decent size and the price is not bad (150$ on Amazon). Anybody had that one or similar?

BTW. I live in Los Angeles (Beverly Hills for the precision). Another ridiculous regulation in California is that ionizer/ozone generators cannot be sold through regular channels for the health hazard they might pose.