Smoke at least 100 cigarettes:

° To make Lauren smoke a lot and quickly I used her in the apartment, I turned on a cigarette and then clicked on the phone so she had to throw it to hang on, then I suddenly made her hang up and turn on another cigarette.

° During the game she doesn't smoke if you controll her, so switch to Joey as much as you can.

° You will know how many cigarettes she smoked just at the end of the game, so right before the END I suggest to save he game when she can still smoke without any troubles, then continue the game, finish it and see if you got it or not, if not, you just need to restore the saved game and let her smoke again (don't try ths at home! XD)

(note: Don't make Lauren smoke on balcony, I followed another guide that specify it so maybe it doens't work)

Smoke less than 20 cigarettes:

° To get this I suggest to finish the game once at least, so you will know exactly what to do and end the game quickly. Remember to switch to Lauren and don't use Joey if not very necessary to make her smoke as less as you can.