how harmful is smoking if i only have one off when im with my mates?!

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Any type of smoke you inhale into your lungs is generally not good for you but the difference between medicine and poison can sometimes be a fine line. For example Mullein leaf can be smoked and acts as an expectorant which might alleviate cold symptoms. So the answer is yes it is harmful to some degree so use your best judgment as to whether it's worth it or not.

If you're only doing it with your friends, and it's not like, every day... You should be fine. I did the same thing for a while, and I didn't ever feel any need to smoke more. I think as long as it's only like once or twice a week, you won't get addicted. And as far as physical harm, there may be a tiny bit cuz it will add up after a while. But 1 every once in a while is nothing compared to a full pack every day, like most smokers have.
Just don't EVER allow yourself to buy your own pack. that was my strategy, and I'm perfectly healthy.

Similar experience.

Can you help it? Can you easily stop yourself from having them? If so, then stop as soon as possible. It could harm you even if you only ever have one. And, you can easily get addicted as you have more. It takes years off your life, you should tell your mates they should stop. But it is their choice, and yours to, but you have to know the consequences.

you need to cut that **** out. soon you'll ask for "puffs" more and more often. then you'll eventually ask for a whole cigarette, then you'll buy your own. just stop now. its for your own physical and financial well being

im a smoker