Although you may be worried about losing your job if you go to rehab, you are much more prone to losing your job if you do not seek help. If you have a substance abuse problem, it may already be influencing your work productivity. By deterring addiction treatment, you risk making your problem more visible, as ongoing substance abuse can lead to noticeable work quality deficits. When using drugs on the job, can lead to termination, there are many federal laws in place to protect your entitlement to treatment. It is illegal to cease employment as a result of an individual seeking medical treatment under such laws.