While on holiday recently, I came across these Camel cigarettes called Activate (or Crush for the Americans). The idea is this new fandangled ball thing that you crush inside the filter to adjust the flavour of the tobacco as you inhale.
I am well versed in these, usually choosing JPS Duo when back home. However, these Camels had two balls in the filter, colour-coded for ease of use. Without crushing anything, the cigarette is normal. Squeezing the blue spot releases a menthol flavour while the purple spot makes the cigarette taste of blackcurrant, and popping both balls causes your head to explode. Seriously.
Smoking is very harmful and addictive. Don’t do it.