1.Even hardcore smokers can become anxious, panicky, suspicious or paranoid.
2.Cannabis affects your co-ordination, which is one of the reasons why drug driving, like drink driving, is illegal.
3.Some people think cannabis is harmless because it’s a plant, but it isn’t harmless. Cannabis, like tobacco, has lots of chemical 'nasties', which, with long-term or heavy use, can cause lung disease and possibly cancer. The risk is greater because cannabis is often mixed with tobacco and smoked without a filter. It can also make asthma worse, and cause wheezing in people without asthma.
4.Cannabis itself can affect many different systems in the body, including the heart. It increases the heart rate and can affect blood pressure.
5.If you have a history of mental health problems, taking cannabis is not a good idea. It can cause paranoia in the short term, but in those with a pre-existing psychotic illness, such as schizophrenia, it can contribute to relapse.
6.If you use cannabis and have a family background of mental illness, such as schizophrenia, you may be at increased risk of developing a psychotic illness.
7.It is reported that frequent use of cannabis can cut a man's sperm count and reduce sperm motility. It can suppress ovulation in women and so may affect fertility.
8.If you’re pregnant, smoking cannabis frequently may increase the risk of the baby being born smaller than expected.
9.Regular, heavy use of cannabis makes it difficult to learn and concentrate. Some people begin to feel tired all the time and can't seem to get motivated.
10.Some users buy strong herbal cannabis (also known as skunk) to get ‘a bigger high’. Unpleasant reactions can be more powerful when you use strong cannabis, and it is possible that using strong cannabis repeatedly could increase the risk of harmful effects such as dependence or developing mental health problems.