Now this is not straightforward. There is clear cases of insurers having to pay out if a non smoker took out life insurance then started smoking some time after:
Ian Williams of Cavendish Online says: 'Once the policy is up and running, the price will not change. The policy will only be invalidated if it could be proven by the insurer that the client had smoked within the 12 months prior to the application.'
As long as the medical records show the policy-holder had taken up smoking after the plan started, the insurer should pay out as usual.
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You will need to scrutinise the small print and if it gives any indication that any changes in circumstances should be notified, it is highly likely resuming smoking will affect the pay out.
For your peace of mind, persuade him to talk to the insurers bearing in mind the payment may be increased.