<human>: This was actually a few weeks ago, but I just realised the consequences of what I did.

Where I live, pretty much everybody smokes shisha (hookah) when we go out for a drink.  Now, shisha *does* contain nicotine, but it's fairly difficult to get addicted, 'cause you can't just pull out a hookah and light up.

About three weeks ago, a few of my friends and I are getting a drink.  As usual, we've got a hookah we're passing around.  After a while, the hookah runs out, and the attendant takes it away.  Everybody has smoked enough, except for one of my friends, let's call her M.

M really likes her shisha, but not enough to order some just for herself.  She's trying to convince me to smoke with her, and I really don't want to.  She starts to get more and more annoying, and I'm like "Look, if you want to smoke so bad, just get a pack of cigarettes."

She thinks this is a great idea, and buys a pack, and proceeds to smoke for the entire rest of the night.

I didn't realise how bad I'd fucked up until yesterday.  I went to her house, and the whole place smelled like smoke.  We sit down and start talking, and she immediately starts smoking.  Turns out she's been smoking a pack a day since then.  I got my friend addicted to cigarettes.  I basically killed her in the slowest way possible.

Summarize the given text in a few sentences.
<bot>: I didn't want to smoke any more shisha, but my friend did, so I told her to smoke cigarettes instead.  She now smokes a pack a day.