Metabolic Syndrome in Diabetic Smokers Using Cigarettes & Combustion-Free Nicotine Delivery Systems

Participants in Arm A will continue smoking their own cigarette brand as usual.

Participants in Arm B will trial and familiarize with their allocated products to select the C-F NDS of their preference. They will be trained and counselled on the chosen C-F NDS; participants will also have the option to try and choose among a selection of either 3 e-liquids or 3 tobacco sticks (depending on the C-F NDS they have chosen). Participants wishing to use a heated tobacco device (HTD) will receive one kit and a full 1 week supply of tobacco sticks of their choice (they will receive a number of tobacco sticks/day corresponding to the number of cigarettes smoked at baseline); those wishing to use a vaping product will receive one vaping kit and a full 1 week supply of e-liquids of their choice (they will receive 4 x 10 ml refill containers).