A NSW anti-cannabis campaign will target teenagers as they travel to school and surf the internet.

NSW Health launched the $600,000 campaign, which it says is designed to warn the 14 to 19-year-old age group on the dangers of starting the marijuana habit.

Print advertisements, carrying tag lines such as "Pot. It mightn't kill you, but it could turn you into a dickhead", will appear in youth magazines and on bus stop posters.

The ads feature a person staring accusingly from a black and white photo and quotes such as: "You've got great eyes, when they're not bloodshot" and "I'd lend you money, but you still owe me from last time".

Cinemas will screen a montage of the print shots, as will online advertisements which are set to run on youth-orientated websites, including myspace, msn messenger and gaming sites.