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Feeling lightheaded when you switch from smoking to vaping is common but usually fixable. This guide gives step‑by‑step solutions — from lowering nicotine strength and switching devices to practical vaping technique and when to seek medical help — plus nicotine‑free options to keep the habit while you adjust.

This 2026 update summarises current evidence linking nicotine e‑cigarette use to changes in insulin absorption and blood glucose control. It explains mechanisms, reviews animal and human studies, describes UK guidance, and provides practical steps for people with diabetes.