Allowing anyone on your premises to produce, give away or sell illegal drugs. So if your parents know that you are sharing drugs with a friend in their house and do nothing to stop it, then they are committing an offence. Allowing anyone on your premises to use cannabis or opiate drugs (heroin, methadone or morphine). Again if your parents know that you are using cannabis, for example, in their house and do nothing to stop it, they are committing an offence. Importing illegal drugs Producing illegal drugs Cultivating a cannabis plant - This carries a maximum sentence of 14 years imprisonment. Supplying or offering to supply equipment for use in association with illegal drugs. Solvents - It is illegal to supply intoxicants to persons under the age of 18, knowing that that person is going to use it for the purpose of intoxication. Butane Gas is illegal to supply to anyone under the age of 18. Driving whilst unfit through drink and drugs - This obviously revolves around the prescribed limit, but there is a discretionary area, where a doctor can be called in to assess that person´s fitness to drive. The effects of cannabis can stay with you longer than those of alcohol. The ultimate end to this could be to lose your licence - this may affect your request for car insurance at a later date. It may also affect some job opportunities. And finally - what you may not realise is that having any sort of drugs conviction will have a bad effect on what you want to do in the future. For example, travel to the USA may well be off limits. Also some jobs will simply not be open to you. Take a thought for your future.