Cannabis

Some people may feel chilled out, relaxed and happy, while others have one puff and feel sick.
Others get the giggles and may become talkative.
Hunger pangs are common and are known as 'getting the munchies'.

Even hardcore smokers can become anxious, panicky, suspicious or paranoid.
Cannabis affects your coordination, which is one of the reasons why drug driving is just as illegal as drink driving.
Cannabis itself can affect many different systems in the body, including the heart: It increases the heart rate and can affect blood pressure.