Table 1.

The attributes of users.

User	Attribute
	Smoking habit	Listening to music	Age	Vehicle type	Gender
P1	Smoking	No	22	–	Female
P2	Non-smoking	No	19	–	Male
P3	Non-smoking	Yes	36	–	Female
P4	Non-smoking	No	43	–	Male
D1	Non-smoking	Yes	26	Luxury	Male
D2	Non-smoking	Yes	51	Basic comfort	Male
D3	Non-smoking	Yes	30	Luxury	Female