cigarettes cause insomnia and Smoking doesn't clock out when you go to bed. Even hours after Can Smoking Cause Sleep Apnea?
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But this doesnt mean that e-cigarettes are entirely without harm

A smoke eater is a high-performance air purification system specifically designed to remove smoke, odors, and harmful airborne particles

Cigarettes yield the highest blood nicotine level that can be achieved - just 3 puffs results in 85% of those nicotinic acetylcholine receptors being occupied by nicotine, a whole cigarette results in 99% occupation

The products commitment to authentic tobacco flavor rather than flavor masking means that prolonged Silver smoking doesnt create the chemical coating sensation that makes some light cigarettes unpleasant in the later stages
And he's really sorry about it