Yes, you may be denied life insurance if you smoke marijuana.

Marijuana is unfortunately considered an illegal drug in most jurisdictions so you could be denied coverage when applying for a life insurance policy. 

There are some life insurance plans you can get that offer guarantee issue with no health or drug questions on the application. Unless the life insurance requires a blood or urine test, the life insurance company would probably never know you use it unless you tell t...

Smoking, and other forms of tobacco use, are harmful to your health, and may shorten your life span. Smoking can reduce your life expectancy, which is the main reason rates for smokers are higher when it comes to life insurance.

It is not unusual for long term smokers to develop cancer of the lungs, throat or mouth. Many smokers also develop COPD or emphysema. 

Any of these chronic health conditions will shorten your life expectancy by years.

If the life insurance company ...