by not smoke get your body so healthy as possible you can.
In a classroom situation the teacher has primary responsibility for the health and safety of all in the classroom, in the sence of things going on in the room that might impact health and safety.
The purpose of health and safety programs, regulations, policies, etc., is to prevent people from being harmed.
One may become a health and safety consultant if they go to University or college. They may study Health and Safety and earn a degree. After having graduated they might become a health and safety consultant for a company.
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Science is a rather broad subject. A nuclear physicist might face radiation hazards, while a chemist might handle toxic chemicals, while an anthropologist might be visiting regions of social unrest, and an epidemiologist might be exposed to contagious diseases, etc. Depending upon the specific hazard, you would develop appropriate precautions to include in your health and safety policy. A health and safety policy is a statement of general practice or intention. For example, it might be stated "Our policy is that the health and safety of lab users and teachers comes first, regardless of cost or inconvenience."
One may find a job for health and safety consultants by searching in their local classifieds. Also, attending a job fair will also yield some jobs for health and safety consultants.
In the US, if your employer does not comply with a health and safety regulation, the company can receive a citation and a fine. If you fail to comply with a health and safety requirement and you employer does not discipline you , your employer may receive a citation and a fine.
No drugs aren't good for your health. For one, you can get lung cancer, hairloss, diseases etc. However if you are talking about medication prescribed to you by a doctor, then it does improve how you feel or how your body reacts to it chemically, but again, it might not be entirely good for your health.
A flu, chemical reaction, etc
You should never mix drugs. The interaction between the two might be harmful to your health.
Health and safety at work is important because no one wants to be injured or made sick by the things they work with. Health and safety is important because without it, injuries and fatalities can occur. Our best investment is health. In any kind of work, if you are injured or if you have incurred any kind of health problems, it is not good because it might affect your performance or the production of the company.
Both, if you are using illegal drugs it will be treated as public health because some people might have a drug overdose and criminal justice well because they're illegal drugs. Hope that sort of answered your question:)