One less? lol
No. As I've said about ten times now: on average, an unvaccinated person is more likely to spread it as s/he will be in the 18-30 age group, and thus on average more socially active than most of the vaxxed, who will be older. That young age group will also be less likely to wear masks, adding to the spread-potential.
There's no evidence the vaccine directly affects infection-spread rates, but we can say it indirectly does so.
Smoking & drinking have a similar age requirement to the vaccine, rendering that particular restriction moot in this comparison. Risky sex without protection may be akin to going out without a mask on. Do we want to control the private behaviour of these people because their choices may endanger their health? Some cultures do, some have banned alcohol & extra-marital sex.
Western society haven't banned these things, despite the risks to health. Why haven't we banned them? Because we believe in the individual's right to choose, within reason, his own risk levels. That same principle should apply to the vaccine.
Another outdated study. The Delta hadn't hit yet.