When entering the UK from an EU member state, you're officially allowed to bring back an UNLIMITED quantity of cigarettes as long as they're for your personal use. (There are a few exceptions, such as when travelling from the Canary Islands - which have special tax status, but they're not relevant here). 'Personal use' includes bona fide gifts to other people (for which you'll receive nothing in return) but not cigarettes which others will buy from you (even if you don't make a profit).
HMRC has set a GUIDELINE figure of 3200 cigarettes as the maximum which they'll normally accept as being for personal use. However if they've got other grounds for suspicion (such as bringing back several different brands) they can still ask questions and, if they're not satisfied that the cigarettes are genuinely for personal use, confiscate your imports.
The limit of 200 cigarettes, referred to by your friend, refers to entering the UK from a non-EU member state (or from EU areas where the normal rules don't apply, such as the Canary Islands or Northern Cyprus).
Chris