The electronic cigarette is the latest and best way to achieve any of the above goals.
By using a rechargeable battery an atomiser to atomise the air and a replaceable cartridge filled with a quantity of nicotine the electronic cigarette is 95% like the real thing but without all the harmful chemicals that are found in a normal cigarette.
You smoke it like a normal cigarette and the nicotine in the cartridge gives your brain the signals it requires. The 'smoke' produced is atomised air and disperses into the air in seconds.