E-cigarette with nicotine | NRT | 3 | E-cigarette with nicotine significantly better | Moderate |
E-cigarette with nicotine | Varenicline | 1 | Varenicline significantly better | Not assessed |
E-cigarette with nicotine | Behavioural support/no support | 4 | E-cigarette with nicotine significantly better | Very low |
E-cigarette with nicotine | E-cigarette without nicotine | 3 | E-cigarette with nicotine significantly better | Moderate |
E-cigarette with nicotine + NRT | E-cigarette without nicotine + NRT | 2 | E-cigarette with nicotine significantly better | Not assessed |
E-cigarette with nicotine + NRT | NRT | 1 | No significant difference | Not assessed |