It sounds like your sneezing when moving between air-conditioned and non-air-conditioned rooms could be a reaction to sudden temperature changes or irritants, which may be worsened by smoking. Smoking can irritate your nasal passages and make symptoms like sneezing more frequent or severe.

• Avoid exposure to sudden temperature changes when possible and try to reduce or quit smoking, as it can worsen nasal irritation.
• Using a saline nasal spray can help soothe nasal passages without the risks associated with medicated sprays.
• If symptoms persist or worsen, a nasal decongestant spray like one containing oxymetazoline may provide relief, but it should be used only for a short duration (usually no more than 3 days) to avoid rebound congestion.
• Consider seeing an ear, nose, and throat (ENT) specialist to evaluate for allergic rhinitis or other nasal conditions that might be triggered by environmental changes and smoking.

If you experience additional symptoms such as difficulty breathing, persistent nasal blockage, or worsening irritation, please consult an ENT specialist promptly.To narrow down potential causes, we will need some more information.Please tell me your age and gender.