If HIIT classes don't make you cut down, I don't know what will! I've never smoked, and always struggle through intervals!
It's like Cross Fit, but without the bonkers cult mentality of CF, and I genuinely cannot smoke in the morning before I go, or I will feel sick. Have also realised the HIIT monthly class package is cheaper than smoking, and this is the real way to get the attention of my stingy heart.