If you are a smoker, it's important that you share this information up front. Your medical exam, which is required as part of your application for term life insurance for smokers, will detect the presence of nicotine in your system. So there's no point in hiding the fact that you smoke when applying for coverage.
It's best to be honest up front about your smoking habit when applying for a Term Life Insurance policy. This way, you can be guided to the options most suited to your needs and increase your likelihood of receiving coverage - at a good rate.